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2000
Type Locality for the Great Blue Limestone in the Bingham Nappe, Oquirrh Mountains, Utah
United States Geological Survey
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Recommended Citation United States Geological Survey, "Type Locality for the Great Blue Limestone in the Bingham Nappe, Oquirrh Mountains, Utah" (2000). All U.S. Government Documents (Utah Regional Depository). Paper 57. https://digitalcommons.usu.edu/govdocs/57
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T OLE OF O. 'TENT Pag e l1USGS . . ~ Abstrn.ct. . , " ... , ...... • , ....•..... ,. 4 sClonco fa.,. 3 ch3ngmq world Introducti on .... , ...... , .... , ...... 5 Regional Geologic Selling of the Bingham Nappe , . , ... , . ,. 8 The Type Section of the Great Bluc Limestone ... , .. , .. , . '. 9 Local ion ...... , , . . .. ,...... , 9 Type Locality for the General Lithologic Charncteristics of the Great Bluc Ltmestone. , , ...... ' ...... , , .. . . , .. , , 10 Great Blue Limestone Silveropolis Limestone Member of Tooker and Gordon. ( 1978)...... , ...... II in the Bingham Nappe, Long Trail Shale Member...... , ...... 11 Mcrcur Limestnne Member of Tooker and Gordon (1978)...... , . . 12 Oquirrh Mountains, Fossils and Age of the Great Blue Limes.one, . , ...... 14 Regional Lithologic anli Faunal Correlations of the Great Bluc Utall Limestone ...... , . , .... , ...... , ... , , ...... , . . 16 East Tintic Mountains ...... , .. , ...... , . , ... , . , . . 17 Southern Oquirrh Mountains-Fivemile Pass appe ... I Nonhern Oquirrh Mountains-Ro,;;en. Canyon appc." 18 Wasatch Mou ntains-Timp:mo!;oS Nappe . , ...... 19 by Ma<.:kenzic Gordon. Jrl. Edwin \V , Too k ~r~ and Wasatch Moulltains-Mount Raymond Nappe ...... 20 J. Thomas Dutro. Jr.' Promontory Mountains ...... 21 Other Neighboring Ranges of the Oquirrh Mountains ...... 22 References Cited ... , ...... 23 Open · Fil e Report- OF ')0·012 Appendices I . Type locality of the Great Blue Limestone on 2000 Silveropolis Hill. Ophir mining district. Utah . . ...26 2. ,{eference locality. Mercur limestone member. Tit" r~port " prc li nllnar) Jnu 11." nul h~~n r~\ I~\\~d fur conlormll~ \\ IIh .5 . G~olugkal un'cy cUllonal ~t3nuard, or \\ IIh th~ North A",~ncJn Great Bluc Limestone. Mercur mil'ing district • (i3li graphl c C\)dl! . r\ ny U\c of trJtil..', tlnn. or pn.'duct nJm~, h fur Utah ...... , .. , ...... , .. ... 46 'cscriptivc purpos~s only anu uuc, nut Impl~ ~ndor U.. DEI' RTMENT OF THE I."OT ERIOR U.S, GEOLOGIC L • R'EY I [;c ~a,cd. z Icnlo Park, CA. anu 1\V a,hlngton. D.C. 3 ILL STR TIO The typ_ locality for the Great llIue Limc~tone In he FIGURE Pag~ Bingham nappe Oquirrh 1ountuins, tuh, J. Index map showing the locution 3. Geologic selling in the Bingham nappe in the e tablished a type locality for thi formal! II '" the qumh southern Oquirrh Mountains and the location of Mountuins. Howcvcr. thc formatl n h,,, ~IDce been correblcd the Oreal Blue Limestone type and reference "ooudly with similar ·edimentary rock- else" here '" the adJOIo'"ll measured cclions...... 56 Rocky Mounta,"s and Greal B:lsin region,. Fm Ihe record. and to 4. Diagrammatic columnar section of the Silvcropolis u. sist futurc corrclations. a type mea~ured ,ectlon 01 the Great Blue limestone member of the Great Blue Lime tone...... 57 I.imcstonc in the OqUirrh Mountains IS locmed. dc\.:rtbcd. ami a 5. Diagrammatic columnar section of the Long Trail Shale dC lol iled measured e tiol' IS IDeluded '" the appcndix . Member of the Great Blue Lime ton' ...... 5 6. Diagrammatic columnar scction of the Mercur The Great Blue LlllIe'tonc con\l\!' III three IlIcmhcr,. The lime tone member of the Grcat Blue Limestone ...... 59 ilvcropolls lime. tone melllber of Tooker and Gnrdun (I CJ7 ). \\ hleh 7 Diagrammatic columnar cction of Ihe Grcat Blue i\ thc unnamed lower limestone of JlIIIlI~ (19J2). It I ;1 ~(iO m Limestonft showing the localion of fossil collection. thick stratigraphic section compo~cd of dark-!!r;l~. IllcdlUm.bedJcd the faunal zones. and age series repr~ entcd...... 60 limestone. intercabled \\ith sand Mane .. nd arl.!lIla~cou, IIme,wne. 8. Regional correlations of the age equivalents of the This is overlain by the Long Trail hale. "hose type locality Gillul~ Great Blue Limestonc in the Oquirrh Muuntains (1932) specified at the head of Long Tr:1I1 Gulch III Ihe Oplllr nunm!' and adjoining mounluin ranges ...... 61 dhtrict. It is 33 m th ick and composed of carhonJccou\ gr;)) shak and interbedded fos3iliferous medium-llray hOle. tone. The 'ereur limestone member of Tooker nnd Gordon (19711). which I' Gliluly\ ( 1932) unnamed upper limestone. i< 471 m Ihick and composed (11 alternating dark-gray fossiliferous. sand). and chert) hllle\lunC' eparalcd by interbedded shale and ,haly limestone mter"a"- The type locality of the Ore;lt Blue Lime,tone i\ nn Ihe ~a'l. trcnding ridge I. km .outh of Oplur (Mercur 7.5-IllI1111tc I Mr. Gordon died before a final d, ... (, nr Ihh ",", 'II ".1' \."t'"I,II.', In 1962. Mackenzie Gordon. Jr.. Helen Duncan. Raymond Regional Geologic ettlng or tbe Bingham appe Lewandowski. and E. W. Tooker measured the type section of the Great Blue Limestone near Ophir. as designated by Gilluly. and made The Oquirrh Mountain arc composed of allochthonous folded extonsive ~o lle ctions of fossils; these are summarized here and listed and complexly faulted upper Paleozoic sedimentary roc ks in five in Appendix I. The fossil collections were studied and reported in nappes emplaced in the foreland of the Sevier thrust belt during the 1978 and 1979 by the senior autbor. Helen Duncan. W. J. Sando. Late Cretaceous SevIer orogeny (Armstrong. 1968; Robert and O. L. Karklins. B. L. Mamet. and in consultation with J. T. Dutro. Jr.. Crillenden. 11173 ; Tooker. 1983. 1999). These include the earliest and G. A. Cooper. Subsequentially. in 1980. Gordon and Tooker arrival. the Pass Canyon nappe. followed in sequence oy the measured a reference section of the Mercur limestone member. Bingham. Roger. Canyon. South Mountain. and Fivemile Pa nappe .. located 1.8 km nOrlh of the Mercur townsite . Mr. Gordon died The Great Blue Limestone or its temporal equivalents occur in the before the fossil collections were described. and Dutro has studied Bingham. Rogers Canyon. and Fi vemile Pass nappes. them. and they are listed in Appendix 2 of this report. The Bingham nappe. whi ch contai n the type locality for the Tooker and Robens ( 1970) described a measured stratigraphic Great Blue Lime tone. i largest in area and the thickest of the section of the Green Ravine Forma ion. the age-equivalent of the thru t-faultet! plates and is exposed in the southern Oquirrh Mercur limestone member in the northern Oquirrh Mountains. They Mountains (Tooker. 1999). The nappe consists of four broad. hi gh recognized that these rocks are in the Rogers Carlyon nappe. a amplitude. locally asymmetrical folds. the Ophir anticline along the different thrust plate from the Bingbam nappe in which the type west side of th e range. the Pole Canyon syncline making up the locality occurs. Gordon and Duncan (1970) collected and listed the central and eastern parts of the range. and the Long Ridge anticline fossils in the Green Ravine Formation. More recently. BuLkis (1975) and Bingham syncline that lie in the northeast pan of the nappe. considered the regional distribution and pbysical and deposition The Great Blue Limestone crops out along the much fau lted nanks of characteristics of the Great Blue Limestone in central and north the Ophir anticline (Fig. 3) and in the core of the Long Ridge anticline central Utah. (Tooker. 1999). The basal Midas thrust is not exposed. but severel imbricate thrusts in the Bingham nappe that have relatively small Although Tooker is mainly responsible for this repon. Gordon's amounts of movement are exposed in the range and along the scientific contributions are a major basis for it. and. in recognition of western range from (Tooker and Roberts. 1988). The folds arc cut this fact. be is designated with gratitude as senior author. Dutro's by steeply dipping transcurrent (tear) and normal faults initiated contribution is the description and identification of the Mercur during a compressional orogenic phase and reactivated during the 9 10 later extension of the Basin and Range region Crooker alld Roberts. A referencc measured stratigraphic section (A ppendix 2) of the 1992). Mercur limestone member is on the hill about 1.5 km northeast of the Mercur mining district, Utah (Mercur 7.S minute quadrangle. AGURE 3. NEAR HERE. Utah). The section begin in Meadow Canyon at the contact of the Long Trail Shale at about the 6,800 ft contour in the SW 114, NW The sedimentary rocks in the Bingham nappe range in age from 114, sec. S, T. 6 S., R. 3 W. (Fig. 3). the Cambrian Tintic Quartzite to the Pennsylvanian Oquirrh Group (Gilluly. 1932: Tooker and Roberts, 1970: and 1998). The Great Bluc The geology of the area was mapped by Gilluly (1932) in the Limestone lies in the middle of these Paleozoic sedimentary rocks Stockton and Fairfield I S-minute quadrangle, by Tooker ( 1987) in and is in the upper part of the Mississippian ~arbonate-rich sequence the Mercur 7.S-minute quaclrangle, and in the Oquirrh Mountains by resting confonnably on the Humbug Formation. The Great Blue Tooker and Roberts (1998) at the scale of I :50,000. The stratigraphic Limestone is overlain conformably by the Manning Canyon Shale sections were measured by tape and Brunton compass. and (Pennsylvanian-Mississippian). Three members of the Great Blue characteristic fossils were collected. Limestone recognized by Gilluly (1932) are designated here as the lower Silveropolis limestone of Tooker and Gordon (1978), the medial General Lithologic Characteristics of the Grcat Blue Limestone Long Trail Shale, and the upper Mercur limestone of Tc,oker and Gordon (1978). The lithologic details of the stratigraphic sequcnce in the type and reference localities are available in Appendices I and 2. but The Type Section or the Great Blue Lime tone several collective features o ~ the three members of the Great Blue Limestone provide useful guides for mapping. Although similar in Location many respects. there are several distinguishing differences between members and their enclosing strata in the Bingham nappe. The type measured section of the Great Blue Limestone (Appendix I) lies about 2 km south of Ophir, Utah, near the top of The Great Blue Limestone is underlain conformably by the the west-facing slope of Silveropolis hill in the NW 114, SE 114, SE Humbug Fonnation of Mississippian age: its prominent ledge-and 1/4, sec. 2S, T. S S., R. 4 W. (Fig. 3), beginning at about the 8,200 n slope topographic expression is the result of alternating sandstone. (2499 m.) contour. The measured section of the Silveropolis quartzite. and clastic limestone layers. The Humbug-Great Blue Hmest.one member trends I.S km easterly toward the head of Long Limestone contact was arbitrarily "placed at the top of the highest Trail Gulch. The Long Trail Shale Member Hes in the saddle. The considerable group of sandstone beds." GilJuly (1932. p. 29) and Mercur limestone member extends up the slope of Hill 8790 and represents a transition from a predominantly sandstone to a continues in an offset upper portion from the crest of the southeast predominantly limestone Hthology. The sedimentary rocks of the trending ridge of Hill 8790 at the head of Silverado Canyon Humbug Fonnation characteristically are brown weathering and northeastward to the South Fork of Ophir Canyon (Fig. 3). Access to throw a distinctive float that contrasts with the blue-gray limestone the section is by unimproved roads from Ophir, via Long Trail Gulch, of the lower massive gray limestone beds of the Silveropolis or via the South Fork, Ophir Canyon (Mercur 7.S-minute quadrangle). limestone. 12 Si/vuopolis limestone member of Tooku and Gordon (l978) continuation of the Greal Blue Limestone section a few meters The lower limestone member of Gilluly. (1932). named for the hill on toward the east. Because of the lack of distinctive beds at the contact which it was measured. is 260 m thicll. is conformable with the of the Long Trail Shale. tbe member was mapped by Gilluly (1932) Humbug Formation. and is divided into three typical conformable mainly on the basis of its topographic expression. where it commonly sedimentary subunhs (Fig. 4). A 122 m-thick basal unit consists of forms a narrow strike valley. This results in some uncertainty about thicll-bedded to massive interbedded dark-gray. thin-to med ium the thicllncss. which be estimated ranges from 8 to 28 m. It raises bedded. iocally fossiliferous argillaceous limestone. locally silicified. tbe possibility tbat the imbricate Long Trail thrust(?) locally may CUl and tan to olive-gray. buff-weathering calcareous sandstone or sandy out parts of the Long Trail Sbale along its strike (Tooker and Roberts. limestone. This subunit. is correlated with the Topliff limestone. 1998). At the type locality. the unit parallels a 17-m thick. sill-like which is the lowest member of the Great Blue Formalion2 at Tintic. unit of altered granodiorite. No comparable Ii!bology representative Utah (Morris and Lovering. 1961). The middle unit is 97 m thicll and of the Long Trail Shale occurs in the Bingham nappe nt Tintic (Morris consists of int.erbedded dark-gray. thin-to-medium-bedded. locally and Lovering. 1961 ). fossiliferous limestone and argillaceous. sandy and cherty limestones. Blacll chert nodules and lenses occur in the dark-gray limestone The Long Trail S"ale consists of interbedded dark-gray to black beds. The upper unil is 42 m thick and contains interbedded calcareous and carbonaceous shales. whicb predominate in the upper medium dark-gray. thin-to-medium bedded. locally fossiliferous part. and thin-bedded. gray. fossiliferous argillaceous limestone and limestone. argillaceous limestone. calcareous sbale and siltstone. fine . brownisb-gray silty limestone in the lower part (Fig. 5). The base of grained calcareous sandstone. and silty limestone. The subunit the middle member represents a transi tion from interbedded sandy characterislicaHy is weathered brownish and tan and generally is limestone. siltstone. and calcareous shale in !be Silveropolis abundantly fos si liferous. The middle and upper subunits are limestone member to predominantly silty si liceous limestone. correlated with the Paymaster Member at Tintic (Morris and carbonaceous shales and argillaceous. fossiliferous limestones above. Lovering. 1961). The upper unit may be attenuated here by a fault whose east side is down a small but unllnown amount in the type FIGURE 5. NEAR HERE locality (Tooker. 1987). Mercur limes/one member of Tooker and Gordon (I 978}-Tbe FIGURE 4. NEAR HERE upper limestone member of Gilluly (1932). bere called the Mercur limestone member for exposures in a reference section (app. 2). Long Trail ShalL-The middle member is at least 33 m thick. as which Gordon and Tooke.r measured on the hill 1.4 km northeast of mapped by Tooker (1987) in the type locality. and apparently is Mercur. Utah. It is 48 1.8 m thick and apparently conformable with conformable with the lower Ilmestone member. A left-lateral fault. the Long Trail Shale. In its type locality. !be member is 470 m !bick. whicb crosses the measured section in !b.e saddle between Long Trail Gulch and Silverado Canyon (Fig. 3). displaces the southern The type section of the Mereur limestone is composed of four characteristic conformable subunits (Fig. 6). The basal unit is 40 m thick and consists of banded interbedded limestone. argillaceous Moni, and Loverinl named thue rocks the 0 ...., Blue Form.,ion in limestone. and shale. Calcareous siltstone and light-brownish-gray. ",colnilion or the predomin.nt thiclcn ....' or . hal. .nd quartzh. over limulon. in the Tinlic. Utah ...... (Monis. oral commun .. 1966). thin-to-medium-bedcled sandstoJ,e layers begin to appear in the 13 14 upper part. Fossils are sparse. The subunit is cut by small. altered porphyry si ll - and dike-like bodies in its lower part. The second subunit is 91 m thick and grades into a zone of platy. medium-gray Fossils and Age of the Great Blue Limestone and light-gray to brownish weathering. partly covered. argillaceous limestone with abundant fossil fragments. The third subunit is 136 The age of the Great Blue Limestone is Late Mississippian. m thick and composed of interbedded medium- to dark-gray. Ii/! hr Datin8 of it in the Silveropolis limestone type section is mainly by to medium-blue-gray weathered limestones separated by thin megafossil identifications in collections by Gordon and Duncan. and of argillaceous limestone and calcareous shale in tervals. Sandy the corals studied by W. J. Sando of !t,e U.S. Geolcgical Survey. limestone also occurs in the upper pan. Locally. the limestone bands Bryozoans were examined by O. L. Karklins. USGS. and the contain spheroidal to lenticular siliceous inclusions that weather foraminifera by B. L. Mamet of the University of Montreal. Some 31 brownish gray. The upper subunit is 294 m thick and not well collections and recollections from this measured section are by tile eltposed on the dip-slope of the type section. It consists of writers. Helen Duncan. and Raymond Lewandowski (Fig. 7). Few interbedded medium-gray. fine-grained to silty. thin- to medium species can be identified beyond the ge,Ieric level in the lists of bedded limestone. dark-gray to bl ack. nodular cherty limestone. and fossils in Appendices I and 2. Either they represent new species. or sandy. argillaceous. and fossiliferous limestone beds. Argillaceous their preservation is not sufficient to permit specific identification. limestone and calcareous shaly intervals in the unit provide the Preservation seems best in the Silveropolis limestone member. characteristic banded outcrop pattern that resulls from more abundant foliage growth in the shale lones. AGURE 7. NEAR HERE AGURE 6. NEAR HERE The lower 46 m contains corals of the FABEROPHYLLUM Zone. These are present in five collections. along wi th f.Jrami nifera of The Great Blue Limestone is overlain conformably by the Mamet's zone 15 (Mamet. 1969). which is equivalent to the Manning Canyon Shale (Tooker. 1987). which almost everywhere In FABl!ROPHYLLUM Coral Zone. This zone is the highest of Meramecian the Oquirrh Mountains occurs in a broad strike valley. At the type age in the Great Basin. The upper pan of the FABl!ROPHYLLUM Coral locality. the Manning Canyon Shale floors the through-going north Zone (latest Meramecian) occupies the lower 46 m of the lower trending valley of the South Forie of Ophir Canyon and the adjoining member. Above this. the formation is Chesterian in age. The CANINIA south-trending Manning Canyon. The steep- brachiopods and pelecypods. are rou l diagnostic. The lower collection forms. appear to be comlllon in the Great Blue Limestone measured yielded foraminifera of possible Zone 15 affinity. A 2.8 -m thick. section. The bryozoan faunule contains a number of new species. In bryo7.0an-bearing limestone. 111 m above the base. provides the general. the taxa of this faunule arc similar to species that occur in lower occurrence of fossils of undoubted Chesterian age. This unit the Upper Mississippian strata of lIIi ois and Kentucky (written contains foraminifera of Mamet's Zone 16. which is Cheste in age but commun .. O. L. Karklins. 1979). not earliest Chester. The boundary between the equivalents of these two series. therefore. lies within the lower member of the Great Blue The top of the Great Blue Limestone Mercur limestone member Limestone. and most probably not far above the highest occurrence is not the top of the Mississippian sediments. In Soldier Canyon. a of FABEROPHYLLUM Zone corals. few mi les to Ihe north. at least the lOWer 130 m of the Manning Canyon Shale is Late Mississippian. The beds immediately below and above these rocks. and in the upper pnn of the Long Trail Shale contain a fairly large brachiopod REG IO AL LITHOLOGIC and FAU AL CORRELATIO S of the fauna. SPIRlFER BRAZERIANUS Girty appears in the Long Trail Shale GREAT BLUE LlMESTO E and cont inues thl .J ugh mueh of the formation. The only coral found in this pnn of the section is the long-ranging AMPLEXIZAPHRENTIS . It becKme increasingly apparent from geologic studies in the Above this. the beds contain sparse megafossils. Oquirrh Mountains that regional correlation of Great Blue Limestone age rocks in the eastern Great Basin IS not simple owing to varia:ions Another important fau nal zone in the Great Blue Limestone. in the sedimentary rocks obtained in different parts of the which roughly indicates middle Chesterian age. is commonly known Mississippian miogeocline and their transport individually eastward as the CANINIA or K Z9ne. The lowest occurrence of these corals is by thrust faults during the Lte Cretaceous Sevier Orogeny. 133 m above the base of the Mercur limestone and consists solely of Sedimentary rock formation in the miogeocline is segmented by an fragments. Sando (written commun.. 1979) observed that in western east-trending. sometimes uplifted Uinta-trend basement lineament American sections. the earliest K Zone corals always are fragmental. into an Oquirrh basin on the south side and the Sublette basin on the The reason for Ihis has not yet been determined. but some sort of north side (Peterson. 1911). Nappes derived from both basins by reworking ;s indicated. The highest CANINIA Zone fossils were found Sevier thrust faults were Juxtaposed across the Uinta-trend buttress 326 m above the base of the Mercur limestone member. In the in what is now the Oquirrh Mountains (Tooker. 1998). Rocks at the remaining 144 m of the Great Blue Limestone. fossils are sparse and type locality of the Great Blue Limestone in the southern Oquirrh not very diagnostic. The highest collection. I m below the lOp. was Mountains are different in some significant aspects from rocks of the from a bryozoan bed which includes ARCHIMEDES . same age in the northern Oquirrh Mountains. r.s well as t.hose in the surrounding East Tinlic. Wasatch. Stansbury. and Promontory Bry07.0ans appear to be abundant and diversified throughout Mountains. Tnis is undoubtedly also true in other neighboring the measured section. FENESTELL.A sp.. POL YPORA . p. and other ranges. The decision to name correla.tive formational units in these fenestrates range throughout the section. Specimens of Cy"TODICTYA ranges se~ms warranted. thus avoiding the past erroneous appear to be more abund!nt in the Silveropolis limestone than in assumption that all rocks of this age arc comparable because they carbonate beds in the Long Trail Shale or Mercur limestonr. were deposited in a simple homogeneous basin system. The close TABULIPORA .p.. FISTULIPORA sp .• and STREBLOTRYPA sp.. with related similarity of faunas in the sedimentary rock sequences provides a ., basis for making r gion31 ~orre l atio." . Thu,. it i, not ,. 'tr,lf glll ' Thl' j1hHIIIIIl.'1I1 l "1'1 \ . Illl' \ 11 till' \khur illth,," li lill 1111 '"I:.: forward e,ercise to correlate the members of the Grcat Blue In Ihl.! Ea" T1I1IIt, 1114.!!i,u rl'd ''-'l' lIol1. " rrllh.Jhl~ fl'P'l.·'"'lIll'd Limestone in the Sllveropolis limestone (type section) with thosc of tCl1lrnrally hy th< ChlOl,,, , hale ""U quartllt< m Thc upp,'rm'''1 h The East Tlntic Mountain. arc located in the (Morris. 1983) from its Oquirrh basin hintcrland. Thc nappe contai n, 1\1 Ihe ,oUlh " nd "I IIIl' O'lu.rrh ~Iountai n . rocks thut arc age numerous north-to-south transiti ons in Palcozoic ,cdimcntary roc k corrcl:llivc \\lIh tI,,· 1}11l' \ kld.I' IlIn<,tone member occur in lhe facies Crooker. 1'.198) inclu ding tho e of the Grcat Blue Limc two distinct thru t-fault terranes or nappes in the Oquirrh Mountai n. represents sediments deposited in the hinterland in u rapidly or Tooker ( 1998) believed that sedimentary rocks in the Rogers Canyon continually subsiding Oquirrh basin. During the Sevier Orogeny. a nappe were deposited in the Sublette basin hinterland nonh of the nappe containing these rocks was emplaced by th: Hebo-Charleston Uinta trend. The nappe moved into its foreland position on the Nonh thrust. in what now is the Wasatch Mountains. in a topographic low Oquirrh thrust to overlap the Bingham and Pa..s Canyon nappes. in the craton on the south side of the uplifted Uinta trend. The Timpanogos nappe is overlain by the Midas thrust. which underlies These rocks correlate faunally with "fairly early- to late the Bingham nappe in the Oquirrh Mountains (Tooker and Roberts. Chester"-age rocks of the Mercur limestone member in the type 1963). The lithologies and thicknesses of the Great Blue Limestone Great Blue Limestone (Gordon and Duncan. 1970). They are also age and other Early Paleozoic formations in the thick sequences of rocks correlatives. but not lithologic correlatives. of the Manning Canyon in the Timpanogos and Bingham nappes are generally comparable Shale and the lowest beds in the West Canyon Limestone of the (Tooker. 1999). Oquirrh Group (Tooker and Robens. 1970). No Merameciatl beds are present in the Green Ravine section. and rocks correlative with the Wasatch Mountains- Mount Raymond Nappe type Silveropolis limestone member are not exposed there. The oldest exposed beds of the Green Ravine Formation resemble those of The thin allocthonous Mount Raymond nappe. which lies on tte the Long Trail Shale and adjacent strata. nonh side of the Uint1 trend. was emplaced by the Mount Raymond thrust. The nappe represents contemporaneous shallow-shelf In spite of changes in lithology. rocks of this age can be deposits from th" eastern margin of the more slowly subsiding recognized faunally . The CANt IA Zone or K Zone of Dutro and Sando hinterland Sublette basin. These beds. for the most part. appear (1963. p. 1974) is distributed widely on Upper Mississippian rocks in strikingly similar composition all:' but are thinner lithologic units the western United States and is the basis for correlation with the than those in the Timpanogos nappe. However. fossils in the Mount Doughnut Formation in the nonhern part of the Wasatch Mountains Raymond nappe. which are age-correlative with the Great Blue and the upper pan of the Chainman Shale in the Confusion Range and Limestone in the Timpanogos nappe. occur in the Doughnut Granite Mountains in western Utah (Gordon and Duncan. 1970). Formation (Crillenden. 1959). The Doughnut is a 122-m thick black Bec use of the structural and stratigraphic differences. Tooker and fossiliferous shale with scattered lenses of silty dark limestone and Robens (1970) proposed the namc Green Ravine Formation to rusty-weathering quartzite at the base overlain by medium-bedded. emphasize the li thologic trtr.sitions in rocks of Great Blue Limestone black. fossilife.rous limestone and dark chen in its type locality. age that are revealed there and in some of the neighboring ranges. which is on a tributary of Big Cottonwood Canyon. These rocks are thinner and more directly comparable with sedimentary rocks of Great Blue Limestone age in the Rogers Canyon nappe. which Wasatch Moulltains-T::"j'anogos Nappe apparently were accumulated in deeper or more rapidly subsiding pans of the Sublelle basi.n. The Doughnut Formation rests Crittenden (195 ) summarized th~ dual characteristics of conformably on the Humbug Formation and is overlain. Carboniferous rocks of the central and southern Wasatch Mountains. unconformably. by the Round Valley Limestone (Pennsylvanian). which include the thick and thin sequences of Baker and others (1949). The thick Timpanogos nappe stratigraphic sequence 2 1 22 On the bas is of il fauna. DUlro concluded Ihat the Doughnul the Descrct Limestone and to the Humbug Formalion of the Oquirrh Formation "is probably equivalent to parts of the Great Blue Mountains. The miss identification of Ureat Blue Limestone-like Limestone and the Manning Canyon Shale" (Crillcnden, 1959. p. 59). outcrops in the Oquirrh Formation seems to be due to the inclusion of On the basis of structures an J lithologies, Crillenden (1959) similar-looking lithologies. The Humbug Formation is a greater concluded that the name Greal Blue Limestone is inappropriate for problem. In some places, the so-t ailed Humbug is overlain by designating these thin-sequence rocks. Meramecian limestones and seems to be older than the Humbug Formation in the type area. Thus. a new look at the lithologies of the Promontory Mountains several Promontory nappes is needed. Certainly. the extension of the Great Blue Limestone terminology in that range is questionable. The Rocks in the Promontory MountainG on nappes, formed in the Sevier Orogeny has jumbled the record of complex sedimentation in Sublelle basin hinterland. was also emplaced by Sevier-age thrust the PaJeozoic miogeoc line. faults. The rocks are different from those already noted in the Wasatch and Oquirrh Mountains and contai.n some perplexing dala Other Neighboring Ranges of the Oquirrh Mountains. that need 10 be investigated more thoroughly. Following a brief field inveSliga ion of the upper Mississippian stratigraphy in the The Great Blue Limestone has been mapped in other nearby Promontory Mountains. Gordon (wrillen commun.. 1983) observed ranges west and south of the Oquirrh Mountains. Most of these some correlation problems with rocks then being mapped as the geologic studies were made prior to the recognition of the impa.ct of Greal Blue Limestone by M. D. Crillenden. Jr. The faunal collections Sevier thrust faults within and between ranges (Tooker. 1983). Each were not from Slrala equivalent to any part of the type Greal Blue of these ranges is composed of one or more nappes that have Limestone in the Oquirrh Mountains. Gordon noted. '1 he colleclions sampled strata deposited in different pans of the upper from the Golden Spike Monument quadrangle arc all from beds Mississippian basin . Complete stratigraphic and faunal records arc younger than the Iype Great Blue and are typical of those in Ihe not available for many of these nappes. and we arc unable presently lower part of the Oquirrh Formation. Those from the Pokes Point to do more than cite the existing pcninent literature and trust that quadrangle arc from rocks older than the Great Blue and typical of additionaJ research eventually will fill gaps in the record and permit the Uncle Joe Member of the Deserel Limestone in the type area of a more rigorous correlation of upper Mississippian stratigraphy. The this formation at Ophir Canyon in the Oquirrh Mountains." TIIis Moore and Sorensen (1979) map of the Tooele 1° by 2° quadrangle clearly indicates that the underlying sandstone mapped by and study by Butkus (1975) provide the most recent interpretive Crillenden as Humbug Formation must be oldel than the type compilation of significant information about individual ranges in the Humbug in Ophir Canyon. where the Humbug overlies the Deseret region based on the following studies of the following neighbor Limestone. ranges: Nonhern Deep Creek Range (Nolan. 1935). Deep Creek Mountain. (Bick. 1959). Stansbury Mountains (Rigby. 1958; and In conclusion, it seems clear that the stratigraphic section in Tooker and Robens. 1971). Silver Island Mountains (Schaeffer. the Promontory Range. n.apped as the Great Blue Limestone. is not 1960). Samaria Mountain. Idaho-Utah (Beus. 1968). Wellsville typical to that in the type region in the Oquirrh Mountains (M. Mountain (Lindsay. 1977). Nonhern Lakeside and Grassy Mountains Gordon, Jr.. wrillen commun .. 1993). The lower part of this massive (DocHing. 1964). southern Lakeside Mountains (Young. 1955). Cedar limestone unit includes beds equivalenl to at least the upper part of Mountains (Maurer. 1970). northern Onaqui Mountains (Croft. 1956; 23 24 and Moore and olhers, 1978), and Thorpe Hills nnd nonhem Tinlic Marnel. B. L. • 1969. Foraminifersl zonalion. in Sando. W. J .. Marnel. B. L.. and Dutro, J. T., Jr .. Carboniferous mealliunal and microfauna. zonat ion in Mouulains (Disbrow, 1957). !he Nonhem Cordillera of U. Unl:.d Slales: U.S. O.ological Survcy Profe.. lonal Paper 613-E. p. EI2-EI7. Maurer. R. I!.. 1970. Geology of Lbo , Cedar Mounwn•• Tooele Counly. Utah: Utah REFERENCES CITED Uaiv ... ity. Sail Lake CilY. fh.D. thesis. 184 p. Moore. W. J. and Sorensen. M. 1.. • •979. GeoIOlY of !he Tooele I" by 2" Annstronl, R. L.. 1968, Sevjer orogenic belt in Ne.ada and Utah: Oeololical quadranlle. UI&h: U.S. C,.olo,lcal Survey Misc<:lI.neous Invesli,lllon. SocielY of America Bullelin v. 79. p. 429.458. Series Map 1-1132. Scale 1.250.000. Balter. A. A., Huddle, J. W., and KIMey. D. M.. 1949. Paleozoic leology Moore. W. J .. SoreOlCD. M. L .• and AnnID. R. A_. 1978. R.coM.i...... of nonb and we .. sid.. of Uinla Buin. Utah: Am.:rican Allocialion leolo,ic map of OD.qul MouDwns Soulb quadrangle. fooele of Petroleum Oeololim Bulletin. v. 33. no. 7. p. 1161 . 1187. COUDlY. UIab: U.S. GeolOlical Surv.y Miscellaneo.. Fi.ld Sludl~ Map Be ... S. S .• 1968. Paleozoic strati,npby of Samaria Mounlaln. Idabo-Ulah: MF-92I. Scale 1:24.000. American Associalion of Peuoleum O.olOlislS Bull.lin. Morris. II. T .• 1983. InlelTelallons of th,uSl . nd transeUlTenl f.ullS in Ihe v. 52. no 5. p. 782-808. .entral Sevier oro,.nlc belt near Leamlnl lon. Utah. in Miller. D. M.. Bick. K.F.. 1959. Slnll,npby of Deep Creek MounlSins. Ulab: and olhen. eds. Teclonic and suoti,nphic sludies in !he . JS lem Or.al American.Association of Petrol.um Oeolo,islS Bullelin. v. 43. no. 5. BOlin: Oeolo,ical SocielY of Ame rica M.moir 151. p. 75·82. p. 1064-1069. Morris. H. T .. and Loverin,. T. S .. 1961. SUOli,n phy of !he Eul Tinlic Bulk ... T. A. • 1975. SedimenlololY and depo.illonal environmenlS of lhe Oreal Mounlains. UIab: U.S. Geololieal Survey Professional Paper 361. 145 p. Blue Llmellone (laic Mississippian). nOrlb c<:nuol Ulab: Ulab Nolan. T. B.. 1935. The Oold Hill mlninl districl. Utah: U.S. Geolo,ical Unhe"ily. Sail Lake Cily. Ph.D. Ibesls. 143 p. Survey Professional Paper 177. 172 p. Crillenden. M. 0 .. Jr.. 1959. Miuissippian .ualilnphy of lb ••enln! PelenoD. J. A. • 19n. Paleozoic shelf-mar,ins and mar,iDal bulns. weSlorn Wualch and weslem UlnlS Mounwns. Ulab. in Williams. N. C .. cd. Rocky Mounwas-Oreal Buin. UDil.d Slales. In TwenlY-Dinlh annu.1 Ouidebook 10 Ihe leology of Ibe Wualch and Uinla Mounlain. uansilion field con'ereDce ,uidebook-I977: Wyoming Oeolo,ical ASJoclalion, area: Inlennounwn Assoc. of Peuoleum Oeolol;'u Ouidebook. 191b " . 135-153. Annual Field Con,..... 1959. p. 63-74 RI,by. J. K.. 1958. Oeology of the Stan.bury Mounl.lns. cUI.m Tooele Counly. Croft. M. 0 .. 1956. Geology of !he nonhem Onaqui Mounlalns. Tooele and Juab Ulab. In RI,by. J. K. • cd .• Ouidebook 10 !he ,colo,y of Utah. No. 13. Counlles. Ulab: Bri,ham Young Unive"i\), Research Siudies OeololY Geolo,y of !he Siansbury Mounwns. Tooele CounlY. UIab: Utah Series. v. 3. no. 1.44 p. O.olo,ical Socl.ly. S4i1 Lake City. Ulah. p. 1-134. Disbrow. A. E.. 1957. Preliminary leolo&lc map of Ihe Fivemlle Pass quadran,le. Robe",. R. J. and Crinenden. M. 0 .. Jr.. 1973. Oro,enlc mechanism. Sevier Tooel. and Wah Counlles. Ulab: U.S. Oool", ical.Survey Minoral orol.nic bell. Nevad•• nd Ulab. I. Dejanl. K. A. and Sholl.n. Roben. Inv.sll,alion Field Siudies Map MF-131 . Seale 1:24.000. eds .. Oravity and lectonics: John WiI.y and Sons. N.w York. p. 409-428 Doollinl. H. H.. 1964. OeololY of !he nonhom Lakeside Mounlain. and Iht Rose. P. R.. 1976. Mississippian carbonale shelf marlins. west.rn United SI.lcs: Onuy Mounwns and vldnily: Utah Uaive"ily. Sail Lake Cily. Ph.D. U.s. Oeololical Survey. JOW1lal of Research. v. 4. DO .. 4. p. 449-466. !hesis. 354 p. Schaeff.,. F. E .. 1960. Strallanphy of !he Silv.r Island Mounl.ins. In Dutro. J. T. Jr.. and Sando. W. J .. 1963. New M;'slssipplan formation. and faunal Schaeff.r. F. B. cd .. GeoioBY of !he SlIv.r Island MounwD •• Box Elder an~ zones la lhe Ches ... rfield Ranle. Ponneuf quadran,le. soulbtul Idabo: Tooele CounUes. Ulab and I!lko Counly. Nevada; Ouidebook to !he ,coloay American Auociatioa of. Pttroloum GeolOllslS Bull.tin. v. 47. aD. II. p. of Utah, No. 13. Ulab GeoloaicaJ Sodcty. Salt Lake City Ulab. p. 79-87. 1963-1986. Sinkamkas. John. 1976. Varisci.... In Gemstones of Nonh America. Oilluly. James. 1932. Oeology and ore deposllS of Ibe Siockion and Fairfield v. I. D. Van NoslnDd Co. Inc .. Princeton. New Je ...y. p. 231-232. quadnDII... Ulah: U.S. GeolOlical Surv.y Prof.uional Paper 173. 171 p. Spurr. J. I!.. 1895. I!conomic ,eololY of !he M.reu< minlD' district. Oonlon. Mackeozlc. Jr.. and Duncan. H. M.. 1970. Blosuotilraphy and UIab: U.s. Geoln,lcal Survey I~th Annual Repon, pt. U. cOlTelalion of !he Oquirrh Oroup and rela... d rocks in !he Oquirrh Papers of an economic charactcr. p. 349-455. Mouowns. Ulab. In Tooker. B. W. and RobeN. R. J .. Upper Paleozoic Tooker. E. W. • 1983. Variations In SltUCtural Slyle and colTel.Lion of rocks in !he Oqulnb Mounwns and Binlham Mlninl districi. UIab: ihrust pl..... In !he Sevier foreland Ibrusl belt. Oreat Salt Lake U.S Geololleal Survey ProfesaJonal Paper 629-A. p. A38-A69. area. Ulab. In Miller. D.M. and oIhcn•• ds. Tectonic and Ko ...... 1.. 0 .• Faddies. T. 0 .. Goodwia. J. C .• and Bryan~ M. A_. 1985. GeoIOIY and strati,raphlc studies in !he .Ul.m Orell BOlin: Oeolollcal ,eoslSlllllcs applied 10 lrade conlrol' al !he Mercur ,old min.. Mereur. Society of America. M.moir 157. p. 61-74. UI&h: American. Instilu", of Minin, and MOlanur,leal En,lne... . ___ 19( 7. Preliminary ,eololic maps. cro.. sections. and explan.llon Prepnal 84-442. 212 p. pamphl.t for Ibe Ophir and M.reur 7.5-minule quadran,l.s. Ulah: Lindsay. R. F .. 19n. PetrololY and petro,nphy of !he Oreal Blu. Fonnalion al U.s. Geolo,ieal Surv.y Open-Fil. R.port 17-152. Seale 1:24.000. Wellsville Mountain. Ulah: Bri,ham Young Uni ..flily Oeology Siudl ••• __ 1999. Geology of !he Oquirrh MounwDs. Utah: U.s. GeoIOlical Survey v. 24. pi. I. p. 115-136. Open-File R.pon 99-S71. 150 p. 25 2 6 Tooker E. W. and Oordon. Mackenzie. Jr .• 1978. Type seelion for lhe Ore .. Bl ue APPENDICES LlmeSlone, Oquirrh Mountains, Utah lab.): Ocolo,i.11 Soeiely of America, Ab.lnclI wilh Pro,rsrns, v. 10.. n. 5, p.240 Tooker, E. W., and Roberu, R. J., 1963, Comparison of Oquirrh Formation Measured stratigraphic sections of the Great Blue Limestone type and se.tions in lhe nonhern and centrsJ Oquirrh Mountains, Ulah, In reference localities on the Bingham nappe in the Oquirrh Geolo,ical Survey Research, 1962: U.S. Ocologieal Survey Professional Paper 4SO-E, p. 1l22-E36. Mountains. Utah __ 1970, Upper Paleozoi. rocks in lhe Oquirrh Mountain. and Bin,ham mlnin, distri.', Utah: U.S. Oeolo,ieal Survey Profe •• ional Paper 629-A, 76 p. I - M~culir~d stratigraphic s~ction of th~ Silveropolis hill type __ 1971, Struclurea related to thruSl faulll in lhe Stansbury Mounllins. Utah. In Geolo,leaJ Survey .....arch 1971 : U.S. Oeolo,ical Survey locality. The lower part of the section is on the sOlithwest slope Profes.lonal PIper ISO-B. p. BI -BI2. of Hill 8790, facing tM Mad of Long Trail Glilch, C. NE 114. __ 1988, Preliminary ,eolo,i. map, cross'seelions, and explanalion s~c. 25. T. S S.• R. 4 W.: an lipper offset portion of the section Is pamphlel (or lhe Blnaharn Canyon Quadrso,le. Sail Lake and Tooel. from a point 0.6 km sOlith~ast along ridg~ r~st to a point Counties, Utah: U.S. Geoloai.a1 Survey Open.PiI. Repon 88-699. seale 1:24,000. 0,1 km north of th~ road crossing Ih~ pass on th~ sOli th ~ast __ 1992. Preliminary ,eolo,le map o( the Sioekion 7. 5·minule qUldran,I •• trending ridg~ at the h~ad of Silvuado Canyon. ~cut toward th~ Tooele Counly. Utah: U.s. Geolo,ical SUlVey Open-Pile Repon 92-385. spring on th~ ecut-facing slop~s of the SOlith Fork, Ophir ..ale 1:2.4,000. Canyon, in the SE 114, SE 114, NW 114. sec. 30, T. 5 S., R. 3 W., __ 1998. Geolo,ic map o( Ihc Oquirrh Mountain. and adjoining South and West Traverae M",·ntains. Tooe\c. Utah, and Salt Lake Counti... Utah: M~rClir 7.S-minlite qliad, ~ngl~ . U.S. Oeolo,lcaI Survey Jpen·Pile Map 98·581, ..II. 1:50,000. Youna, 1. C .. 1955, Oeolo,y o( Ihc soulhcrn lakeside Mounllins, Utah: Utah [Measured by Mackenzie Gordon, Jr .• Helen Duncan. E. W. Oeolo,leal and Mineralo,kal Survey Bulletin. v, 56. 116 p. Tooker, and Raymond Lewandowski, Seplember. (962) Thickness Distance (m) above base (m) Manning Canyon Shale (lower bed only) Mostly covered slope in floor of the South Fork of Ophir Canyon. Shale, dark gray. weathers light tan-gray to purple-gray and olive-gray, fine grained, interbedded thin 5- to 7-cm-thick, platy, silty and argillaceous limestone bands Conformable contact MerCD.r limestone member-upper member, Great Blue Limestone 38. Limestone, gray, weathers medium gray. some prominent nodular and lensing chert beds up to 3 m thick at 18 m; fragmental fossil (bioclastic) debris abundant, sparse fossils 20.1 460.5 27 28 32. Cherty limestone. mass ive. blocky. imilar 10 unit 30 0.6 392.8 USGS colin. 21 I 95·PC (rom I m be low .op o( unit Fil .uliporoid. ,en. & Ip. inde ... bi(olil.e (onn 31 . Covered. cherty limestone. limestone. and Trepollomltous bryozoan, ramose (orm argillaceous limestone and shale float 3.3 389.5 S.enoporoid. ramose (onn FENESTEU.A sp. inde •. Fenes.elloids. inde •. 30. Cherty limestone. medium light gray wilh CYSTODICTY A7 sp. brownish-gray cast. weathers lighter gray. PSEUDOBATOSTOMa.LA7 sp. tan weathered chert in scattered pods, blocky. STREBLOTRYPA7 sp. medium bedded; fossils poorly preserved in top POL YPORA sp. inde •. ARCK1Ml!DES sp. 1m 1.5 388.0 STREBLOTRYPA sp. Rhomboporoid bryozoln. Indet. 29. Limestone. gray, weathers medium-light gray. BUXTONIA sp. silty to fine to sandy grained. platy to slabby PROTONIElLA7 RlCKARDSI Giny OVA TlA sp. inde.. «(n,men.s) beds; some beds fossiliferous; interlayered thin ClEJOTKYRIDINA sp. Inde •. «(rl,ments) bands. dark-gray limestone. weathers gray. beds COMPOSITA7 sp. inde •. «(nsments) up to 20.3 cm, hard siliceous. locally bioclastic Terebn.uloid. ,en & sp. inde •. with fossi ls 2.7 385.3 A VICUlOPECi'EN sp. Pectenoid frasmcDu. indcl. Crinoid column.ls. inde •. USGS colin. 21184-PC (rom 1.5 m lbove bue o( unit FENESTEllA .•p . inde •. 37. Chert. gray. weathers light gray to light Fene ..elloid. indel. brownish-gray. subvitreous. very irregularly TreposlomalOUJ bryozoan . inde •. bedded with some lenticular layers of medium EOUSSOOIONETES sp. dark-gray. fine-grained to sandy limestone; no INFlATlA 7 sp. fossils. some organic debris; upper 7 m covered. 10.0 450.5 28. Sandy limestone. gray. weathers Ian to light 36. Covered. top is about 8 m above and east of the gray. mouled, medium grained. thin bedded and stream bed of South Pork. Ophir Canyon 39.4 440.5 platy. poorly exposed on covered slope 16.4 368.9 35. Sandy limestone. gray. weathers medium gray. 27. Limestone. gray, weathers tan to medium light mottled locally. brownish weathered zones gray or light brownish gray, silty to fine sandy. in coarser sandy lenses. fine-grained massive interbedded argillaceous l.imestone containing ledges on dip slope 0.8 400.3 sil.icified productid brachiopods at 1.5 m and 2.1 rn; upper 3.2 m covered slope with shale and 34_ Argillaceous limestone and shale interbedded; platy argillaceous limestone float .6 363.3 float OD covered slope 5.9 394.4 26. Cherty limestone, gray. weathers light gray. 33. Limestone, medium dark gray. weathers gray. blocky, fme grained with lenticular layers of fme g.rained, silicified, irregularly rounded black chert. poorly exposed on ridge top; weathered surface, some calcite and quanz unfossiHferous. Thicker sandy limeslone and veinlelS 1.0 393.4 cherty limestone up to 20 cm thick interbedded in upper 4 m 18.2 345 .1 29 30 EOUSSOOIONETES sp. Offset in measured section. 0.6 km northwest on ridge SPIRI FER BRAZERLANUS Giny separating the head of Silverado Canyon and BEECHcRIA .p. indel. A VICULOPECTEN sp. the South Fork. Ophir Canyon to the .. rest of GulrOpod. ,en. & sp. indel. Hill 8790. Meas ured section contjnues PALADIN CHESTERENSIS Weller and Weller upslope to the west. USGS colin. 2133 1·PC. slJlle localily u above 25. Shale and argil laceous limestone float; covered Treposloml'ous bryozoan, Indel.. ramose (orm slope 6.0 339.1 Stenoporoid. ind el"rlmose (orm FENESTELLA .p. CYSTODICTY A7 sp. 24. Sandy limestone. dark gray. weathers gray. Rh ombvyu,oid indcl. medium to coarse grained. beds up 103m thick. SEMICOSTEU.A n. sp. well jointed 2.1 337.0 lNFLATIA BlLOBATA Sadlick ANnQUATONLA arf. A. PERNODOSA EasIOn 23. Limestone. similar to unit 21. but unfossiliferous COMPOSITA7 .p. icdel. 6.3 330.7 SPlRlFER BRAZERlANUS Giny Pelecypod. ,en. & .p. indel. 22. Limestone. similar to unit 21; basal I m thick BORESTUS? .p. brachiopod 70ne overlain by 2 m of Hish·spired suuopod. ,en. & .p. indel. Crinoid (olum:..ls. indct. sparse brachiopod fossils 2.9 327.8 USGS colin. 21182. same bed u 21179·PC bUI USGS colin. 211g0·PC from blsal beds on ridse 0.6 kms 10 SOUlheUI CANINIA (SlPHONOPHYLLlA?) sp. Slcnoporoid bryoloan, missive Stenoporoid bryoloan, (olialt Stcnoporoid bryozoan, ramose FENESTELLA. 2 sp. FENESTEUA sp. Rho ' nboporoi~ bryozoan. inde .. FencSlclioid. indcl (PENNIRETEPORA? . p.) CYSTODICTYA? sp. PENNIRETEPORA .p. EOUSSOCHONETES sp. CYSTODICTY Asp. iodeL INFLATIA BILOBATt.. Sadlick FISTULIPORA .p. indel. Fl.EXARJA .p. FiSluliporoid. indel.. bifolialc KROTOVlA7 . p. STREBLOTRYPA 7 .p. DlAPHRAGMUS .p. TABULlPOr.A . p. (resembles T. arf. IN ERMIS) ANTIQUA1'ONIA alT. A. PERNODOSA Easlon INFLATIA BlLOBATA Sadlick 70V A TlA .p. indel. Fl.EXARJA .p. PALADIN CHESTERENSIS (Weller and Weller) ANTIQUATONlA alT. A. PERNODOSA EasIOl1 Crinoid columnals. indcl. 21. Limestone. dark gray. weathers medium dark gray. medium bedded. blocky float . panly USGS eolln. 21183-PC. 4 m up ""ction from silicified; interbedded silty to fine sandy 21182-PC CANINlA (SIPHONOP/fYLLlA 7) sp. limestone. weathers light brown; gray limestone contains silicified fossils 10.9 317.0 20. Limestone. grayish black, weathers gray to USGS colin. 21 I 19·PC. S 10 6 m above bue light brown. medium bedded. beds up to 0.3 m of unil thick,fine grained, locnlly silty. well jointed; in ter FENESTELLA . p. iodel. bedded 2-m thick. poorly jointed. platy dark Fene.leU"id. indel. gray limestone intervals separale 0.3-m thick ARCHIMEDES • • p. indel. PSEUDOBAl'OSTOMEU.A ? sp. jointed limestone in lower pan 4.8 312.2 3 1 32 19. Limestone, dark gra y to dark medium gray, weathers similarl y, platy, thin bedded, very 17. Limestone, dark gray, weathers gray, fine· fine grained platy float: interbedded thin shale, grained: banded, ellipsoidal black chert nodules, panieularly in the lower 3 m, a few fossils. weathers light brownish gray 6.0 278.2 The same section, 0.6 km southeast, exposes more massive limestone beds up to 23 cm thick below the the uppennost platy beds, contains 16 . Bedded chert or very siliceous quartzite, dark sparse fossil fragments 23.5 288.7 gray, weathers gray, very fine grained, brillle, highly jointed in beds 13·30 em thick 10.9 267.3 USGS oolln. 2118t·PC, t m ioterval It middte of unit, offset Ipproximl tety one·hllf mite i 5 Limestone, dark gray, weathers light brownish to southeut of 21t 6t·PC CANINIA (SIPHONOPHYLLIA1) cr. C. (S.1) light olive· gray, impure silty, platy in ::"ds up to NEV ADENSIS (Meek) 0.4 m thick, local laycrs arc well banded in upper FENESTEllA sp. pan, grades upward into sparsely fossiliferous SEPTOPORA sp. pure limestone. A bed about 1.0 m thick has SEMICOS1CLLA n. ' p. SANTIQUATONlA arf. A. PERNODOSA Easton FLEXARIA sp. at 36 m 59.3 208.0 OVATIA 'p. Productoid, ,en. cl .p. indet. 14. Covered interval, platy Itmestone float, small CLEIOTHYR1DINA 'p. fragments SPIRIFER BRAZERlANUS Giny .8 199.2 ANTHRACOSPIRIFER .p. indet. PALADIN .p. iodet. 13. Limestone, dark gray, weathers gray with reddish tinge, fine grained, less s ili c eo~ s than 18. Limestone, gray, weathers lighter gray, fine unit 9, slightly fossiliferous, poor precruslation 13.4 185.8 grained, si lty, few chen nodules: fos siliferous, at 46 m CANINIA coral bed at the top 4.5 n 4.2 USGS colin. 211 60-PC i, II m .bove base Productoid, ,en. 4< .p. Indel. USGS colin. 2t t6t ·PC from 4 m lbove A VICULOPECTEN sp. bale CANINlA (SIPHONOPHYLLIA1) cr. C. (S.?) 12. Covered interval, limestone float similar EXCENTRJCA (Meek) to unit 9 R1.lGOSOOIONETES sp. 24.9 160.9 N. sen. arf. ELLIOTELlA, n. ' p. ANTlQUATONIA off. A. PERNODOSA Easton II. Limestone, dark gray, weathers gray, very COMfOSITA SUBQUADRATA TRANSVERSA Girty? fine grained, similar to unit 9 0.5 160.4 ANTHRACOSPlRlFER SP. USGS colin. 27333-PC, fro" the ..me horiwn 10. Covered interval, limestone float si milar to io the offset section to the southeut unit 9 17.4 143.0 CANlNIA (SIPHONOPHYLLIA1) cr .. C. (S.1) NEVADENSlS (Meck) 9. Limestone, dark gray, weathers gray, very fine Stenoporoid bryowln (1), folilte. incruSlin, POL YPORA 'p. grained with sandy limestone and black chert SEPTOPORA Ip. iJldct. clots and bands, and spheroidal to lenticular INFl.ATlA sp. siliceous inclusions that weather browni~h, ANTIQUATONIA arf. A. PERNODOSA Easton SPIRIFER BRAZERIANUS Girty beds 15 cm to 0.6 m thick, visible fossils occur PALADIN CHESTERENSIS (Weller and Weller) as scattered clastic fragments, top bed contains more detrital material and several brachiopod 33 34 and coral cross sections 12.2' 130. limestone. gray. weathers gray. pl aty. fine grai ned. locally with {o;sil zones 16.2 17.2 USGS col' •. 27329·PC 112m lbove bue: RlJGOSOCJiONEJES sp. Producloid. ,eo. .t .p. indel USGS collo. 27328-PC from crinoidll SPIRIFER BRA2.ERIA.NUS Giny limeSlone 1.2-t .8 '" lbove bue of unil may SULCATOPINNA sp. coollin foraml. bUI Ilso include. poorly preserved fOlSill identined in the nelJ IS FENESTEU.A. INFLATIA. FLEXARIA. lar,e 8. Covered slope. platy limestone. dark gray. produCloid fraamen lS. indel .. CLElOTHYkIDINA. SPIRIFER weathers gray. banded. more siliceous bands BRAZERIANUS Oinv. ANntRACOSPIRlFER. wealher dark brownish gray. more limy SEPTIMYALINA ....1 LIMtPECTEN materials weather light brownish gray. corn I Porphyry si!! (4.0) from top of unit is CANINIA (S IPHONUPHYLLlA?) sp. indel. 56.6 74.2 3. Sandstone. light brownish gray. weathers brown. medium grained. subangular to subrounded Tertiary porphyry sill. altcred (0.6) grains in siliceous matrix 1.9 15.3 2. Covered slope. noat from limestone and siltstone 7. Covel ~ U slope. platy limestone and porphyry dark gray. thin bedded. resembles unit I of the noat: limestone. dark gray. weathers gray . Long Trail Shale 11.5 3.8 very fine grained 16.0 50.2 I. Limestone and shale. interbedded: limestone. Teniary porphyry dike crosses at small dark gray. weathers gray to mouled brown. angle to bedding (2.2) medium to coarse grained. in three prominent limestone outcrop ribs up to 15 cm thick Unit 7 continues 8.0 42.2 separated by shale. Interlayers of shale and limestone similar and limestone resembles 6. Limestone. gray. weathers gray. medium to unit 4 of Long Trail Shale: very fossili fe rous 3.8 coarse grained in beds up to 0.3 m thick 0.0 separated by thin shale and limestone USGS colin. 20267·PC partings and layers. poorly preserved fossil Conulariid. ,en. .t Ip. indel. poor exposures 10.4 39.8 TrepoSlom.,ou. bryozoan.. 2 forml . ramose Stenoporoid. two (orm a, incrustin, Ind musive FENBSTELLA Ip. (IWO fomu) 5. Sandslone. similar to unit 3 6.4 33.4 CYSTODICTY A? sp. Bryozoao lodel. 4. Covered interval. mostly plaly noat from RHlPlDOMELLA Ip. (amall) interbedded layers 0.3 to 1 m thick composed SCH.JZOPHHORIA alT. S. TEXANA Giny SCH.JZOPHORIA d . S. RESUPINOIDES (COl) of argillaceous shale. calcareous sandstone ORTHOlETFS &p. with thin limestone interlayers. siltstone. EOUSSOOfONETES sp. fossiliferous limestone. and interbedded shale. RUOOSOCHONETES ? Ip. indtt. argillaceous limestone. and coarse arenaceous BUXTONlA ? Ip. i1Idet. ~QUATONlAn . &p . A crinoidal limestone: noat from thin porphyry OVA TlA Ip. i1Idet. sill (7) of unknown thickness the in lower 5 m: COMPOSrrA SUBQUADRATA (Hall) unit similar to unit 4 of Long Trail Shale: shale CU!lOTHYRlDINA &p. grayish black. weathers mouled brownish gray: SPIRlFl!R BRAZERIANUS Giny ANntRACOSPIRIFl!R CURVILATERAUS BRUTUS Gonion 35 36 BRACHYTHYRIS 'P. MA,RTI IA sp. indel. brownish gray. rine· to medium·grained with PUNCTOSPIRIFER TRANSVERSUS (Mc:ChC5ney)? crinoidal layers. thin bedded up to 10 cm thick. ?RETlCU!.ARUNA GONIONOTA (Meek) grades upward into banded shaly siliceous HUSTEOIA 'P. siltstone; fossiliferous 4.9. 28.1 BEECHERIA 'P. OIRTY1!l.I..I " p. AVlCULOPl:CTEN sp. USOS colin. 20266-PC. rrom basa l pan of UMIPECTEN? sp. unit STRI!BLOPTERIA? .. p. AMPLEXlZAPHRENTlS sp. CYPRICARDELLA d . C. BRAZERIANA Omy FENESTELLA 'P. CYPRJCARDEllA cf. C. VARICOSA ainy TABUUPORA sp. (rucmbles T. INERMIS (Oiny» UNOU!.A .p. SPHENOTUS sp. (IWO forms) EDMONDIA? sp. SCHlZOPHORlA alf. S. Tl!XANA Oi ny? WORTHENIA sp. SCHUCHERTELLA sp. Coiled nautiloid. cen . .t sp. indel. R~sp. PALADIN sp. a>IJSSOCCHONElES sp. Crinoid columnals. indel. PROTONIELLA RlCHARDSI (Oiny) INFl..A TIA sp. Indel. KROTOVIA? sp. lodeL USOS colin. 211S9·PC rrom same unil. ncar OVATIA alf. O. DUODENARlA (Easton) localily 20261·PC al base or unil alf. n. AMPLEXlZAPHREN11S sp. N. GEN. PUONOIDES 'P. COMPOSTTA SUBQUAORATA (Hall) SCHIZOPHORlA cr. S. RESUPlNOIDES (Cox) RUGOSOCHONETES sp. indct. COMPOSrr A sp. CRURTTHYRlS sp. Producloid. n. ccn .. n. sp. Iff. PRODUCTUS MOOREFlELDIANUS Oi"y ANTHRACOSPIRlFER CURVtLATERAUS BRUTUS Gordon INFl..A TIA sp. indel. EUMETRlA? sp. indel. HUSTEOlA . p. ANTlQUATONIA n. sp. A OVATIA Iff. O. DUODENARlA (Easlon) VOLSELUNA? 'P. Rhynchonelloid. cen. .t sp. indel. CVPRlCARDELLA cr. C. BRAZERlANA OIny COMPOSrrA SUBQUAORATA (Hall)? SPIRIFER BRAZERIANUS Oiny USGS colin. 211S8·PC, same Io NIUIHoid. ,en. 4< .p. indel .• ANTHRACOSPIRIFER cr. A. SHAWl Gordon USGS colin. 27318·PC II bue of uni l 3. Shale. grayish black to very dark gray. weathers Hom coni. indel. mOllled brownish-gray. fissile with sparse silty AMPL£XIZAPHRENT1S .p. Slenoporoid. ineruJling form particles. moslly clay shale. poorly exposed 5.4 22.7 Rt.1GOSOCHONETCS sp. 1Nfl.AnA d . I. B1LOBAT A Sad lick Porphyry sill (17.8) OVAT1A ' p. indeL ECHINOCONOfUS , po indel. 2. ANTIQUATONIA sp. indel. Lim~stone and shale. interbedded; limestone is CLEIOTHYRIDINA sp. indel. silty and siliceous. brownish gray. weathers PclmllolOln debris. indel. medium brown with greenish cast. very fine grained. locally fossiliferous brachiopod. 38. Shale. siltstone, limestone, and calcareous bryozoan.and crinoid fragments; shale dark gray. sandstone interbedded; shale. thin bedded. weathers gray. fine grained. thin bedded. fissilr; Vtry dark gray. very fine grained, weathers mostly covered slope 18.6 4.1 light yellowish gray separates more resistant 1. Limestone. silty and siliceous. brownish gray. limestone and sandstone ribs; limestone, dark weathers medium brown with greenish cast. gray, wealhers grayish yellow-green; sillstone very fine grained. sparse fossils. grades upward brownish gray, weathers brown, fine to in upper third of unit into banded shaly 4.1 medium grained. breaks with conchoidal fracture, not fossi liferous 4.3 254.3 Total thic.kness of the Long Trail Shale 33.0 37. Limestone, medium dark gray, weathers Conformable contact dark gray, mel ium bed USGS colin 27319·PC 01 lhe bue or lhe uni l Horn coral AMPLEXIZAJ>HRENTJS sp. 28. Limeston.:, cray, weathers medium light gray, FENESTI!U.A sp. fine grained, thin 10 medium bedded, up to Fene!~o !!{'idl. iude •. 25 cm thick; local fragmental fossil (bioclastic) TABUUPORA .p. (resembles TABUUPORA AMERICANA Uir ieb, (rom IlIInoil and Kenl.uek y) same at lOp 2.6 206.9 Tr_poslorllel, indel., bi(olill_ (orms Slenopo,, ~ d, ind_l. inerullin, (orm 27. Shale float, covered slope 11.0 195.9 OVATIA .p. indeL COMPOSrrA sp. 26. Limeslone, gray. weathers gray, medium grained ANrHRACOSPIRIFER d . A. SHAWl EXOI.ETUS GordoD thin bedded slabs up to 8 cm thick; . agmental Pelmllozoan debril. indet. fossil (bioclastic) lenses locally 2.8 193.1 34. Limeslone, medium dark gray, wealhers gray, 25. Shale flt. ~! cn covered slope 2.6 190.5 thin to medium bedded, local fragmenlal fossil (bioclastic) sand layers 3.7 234.6 24. Cherty limestone, gray, weathers gray, thin bedded, large irregular pods and nodules of 33. Argillaceous limestone, buff, weathers, light grayish tan chert, fine lacing of calcite vein lets; brown, platy to thin bedded, locally with no fossils 0.7 189 .. 8 nodular black chert, thin siliceous limestone interlayers 3.5 231.1 23. Shale and thin platy limeslone noat, covered 4.1 185.7 32. Limestone, medium dark gray, weathers gray, 22. Arenaceous limestone, gray, weathers gray, thin to medium bedded, local fossil fragment medium bedded, up to 23 cm thick,; fossil (bioclastic) sand layers 5.7 225.4 fragments and crinoids in fossiliferous limestone 9.5 176.2 31 . Limestone, very dark gray, weathers bluish USGS colin. 21194-PC II base or unil gray, very fine grained, locally inlerlayered CYSTODICTYA ill. C. MASOR Ulirc:h nodular black chert and argillaceous limestone; FISTULIPORA .p. FiIlUliporold, (011 lIe 10 massi.e (orm sparsely fossiliferous 5.7 219.7 FENESTEU.A .p. FenCllellold? indel. 30. Limestone, medium dark gray, weathers gray, PENNIRlrI'EPORA .p. slj~htly sandy; 30 cm massive ledge.fonning bed TABUUPORA ill. T. INERMJS (Gloy) Slenoporoid, ramo.. (orm at base contains silicifi.ed ORTHOTETES on StcDoporoid, (011 lIe (orm uppermost surfa.. ~ 7.0 212.7 RUOOSOCHONET'ES? II' ANTIQUATONIA sp. A USGS colin. 27326-PC CRANAENA? sp. ORTHOTETES, cr. O. KASKASKJEt.I ~jS (McOIcsney) INFJ..ATIA sp. USGS coIlD, 27320-PC at 0.6 m lbo._ b... o( formltion 29. Nodular limestone and calcareous shale, Hom eoral, indel. interbedded; limestone medium dark AMPl.BXIZAPHRENTIS Ip. CYSTODICTY A 1If. C. MASOR Ulrich gray, weathers gray to light brown; shale SleDoporoid, IDerultiDI form mostly covered 3.2 209.5 FENESTEU.A sp. FISTULIPORA sp. 4 1 42 PENNlRETEPORA sp ECHINOCONCHUS sp. (small) ANTIQUATONIA sp. A 17. Cherty limestone and black block chert. inler CLHJOTHYRlDINA sp. bedded: limestone is gray, weathers gray, ANTHRACOSPlRIFI!R cr. A. SHAWl GonIon fme grained, thin beddcd up to 10 cm, jointed. Fisb remaiol, indol. chen mostly in lower 1.8 m 4.1 159.6 21. Limest.oDe, dark gray, wea!hers medium dark gray fine grained, black chert layers, lenses 16.. Black cben and gray limestone: float-covered slope and nodules up to 10 cm !hic!; 1.5 174.7. 12.9 146.7 20. Calcareous sbale and argillaceous limestone, 15. Limestone, medium dark gray, weathers gray, interbedded: sbale, light gray, wea!hers buff, fme to medium grained, thin to medium argillaceous limestone locally contains nodular bedded: iDterlayered fragmental fossil (bioclastic) chert: mostly covered 2.2 172.5 sand lenses: very fossiliferous: upper .5 m covered 2.2 144.5 19. Limestone, gray to dark gray, weathers gray USOS colin. 21192-PC wi!h bluish cast. thin bedded up to IS cm, FENESTElJ..A sp. slabby: interlayered tan. fine grained POLYPORA ;po calcareo...s sandstone: abundant silicified fossils 2.8 169.7 CYSTOOICTY Asp. TOM~ODUCTUS sp. USOS colin. 21t93·PC STRIATlFERA d . S. BRAZERJANUS (OIRTY) Filluliporoid, incrullinl rorm CYSTODICTYA air. C. MAIOR UlriCh USOS colin. 2732S-PC FENESTEU.A 'I'. (IWO srecia) Hom coral. indel. POLYPORA sp. AMPI.EXIZAPHRENTIS sp. STREBLQ11tYPA '1'. CYSTODICl'Y A air. C .. MAJOR Ulrich TABUUPORA7 sp.. encruslinl F1STUUPORA sp. SI.noporoid. inerullins rorm FENESTElJ..A ' p. Rb"."boporoidl indel.. (three specics) STREBLOTRYPA sp. Produeloid. indel. (1m In, semirctieutlle) TABUUPORA7 . p .•en erullinl OUltopod, plllyeeral•• ClD rorm Onholel.Old7, len alp. indol. TOMIPROOUCTUS sp. USOS coli... 2732t·PC STRIAT1fEllA d. S. BRAZERJANA (Oin yi FI!NES1l!U.A IJI. OlRTYELLA IJI. F 18 . LimelloDe. medium dark gray, wel!hers gray, 12. Shale and platy limestone float on covered fine grained. thin bedded, jointed: poorly slope 2.9 130.5 exposed block flOII. mostly covered 6.0 163.7 I I. Calcareous sandstone, olive gray, wea!hers 43 4 4 brown-gray. medium grained. thin bedded; grained. thin to medium bedd"d; inl"i1aycrcd inlerlayered limestone. gray. fine grained. platy silty limestone; fossi liferous 45.0 28 .0 thin bedded. mostly float-covered slope 2.2 128.3 USOS colin . .2t887·PC from 0.3 m thick bed 10. Argillaceous limestone. dark gray. platy to at 3 m above base thin bedded. mostly float-covered slope 3.0 125.3 FABEROPHYLLUM .p. U::OS colin. 21t89·PC It 6 m above base 9. Calcareous sandstone. tan. weathers buff. PLEUROSIPHONELLA VIROINICA (BUllS) fine to medium grained. platy to thin bedded. thick weathered surface rind. had ilicificd USOS colin. 27323- PC >l 6 m PLEUROSlPHONELLA 'p. interior; hard siliceous calcareous bed at top; FABEROPHYLLUM sp. upper part mostly covered slope 3.8 121.5 CLISIOPHYLLUM .p. CANAOIPHYLLUM? . p. 8. Limestone. light tan-gray. weathers slightly Zaphrentoid corat . indet. lighter tan. fine to medium grained. thin Hom corals. indcl. bedded. locally silicified. abundant calcite USOS colin. 21190 It 2t m above base vein lets and blebs; not fossiliferous; mostly COMPOSIT A? sp. ind.t. covered in upper 0.8 m TYLOTHYRtS sp. 1.8 119.7 PROMYTILUS Ip. MYALtNA? .p. ind.t. 7. Platy limestone and shale float. mostly covered 26.4 93 .3 A VtCULOPECTEN sp. SCHIZODUS 'p. 6 Limestone. dark gray. weathers light blue.gray. fine grained. thick to medium bedded; USGS colin. 612F3Sa at 30 m above base Silicified brachiopods and "worm mark ings." indcl. intl:rlayered argillaceous limestone. poorly exposed 12.0 81.3 3. Limestone. dark gray. weathers gray. fine grained. thin to medium hedcled. locally si licified. conchoidal 5. Argillaceous limestone. dark gray. thin bedded; fractured; interlayered arenaceous. bioclastic mostly covered. locally fossiliferous. silicified 8.3 73.0 and argillaceous limestone; locally very fossi liferous 18.0 U OS colin. 2tt9t·PC. between 2 and S m USGS eolln. 2tt8S·PC at 0.3 m above b.... TO~.iIPROOucruS sp. OVATlA .p. PLEUROSIPHONELLA? .p. COMPOS ITA aff. C. PENTAGONA Weller FABEROPHYLLUM? .p. TYLOTHYRIS .p. CLISIOPHYLLUM sp. BRACHYTHYRlS ' p. Hom co ~all ind.t. Echinoid 'pine,. indet. CRURITHYRlS? .p. Bell.rophoL:&cean. s.n. & .p. ind.t. USOS colin. 27324-PC •• t 3.8 m above base TOMIPROOucruS sp. USGS colin. 2tt86·PC in 0.3 m·th ick limeston. OVATIA .p. at tt m above b.... COMPOSITA aff. C. PENTAGONA Wetler PLEUROSlPHONELLA cr. P. VtRGI!'IICA (Butts) TYLOTHYRIS sp. FAB EROPHYLLUM .p. BRACHYTHYRlS .p. ROTIPHYLLUM 'p. EUMIITRlA VERNEUILIANA (Hall) CUSIOPHYLLUM .p. OIRTYELLA Hom corlb. lndel. 4. Limestone. dark gray. weathers gray. fille 45 46 USGS colin 21187· PC on O.5m limCSloue at 17 m above bue 2 - M~as ured stratigraphic sution of th ~ r~fu~nce section of th ~ Mucur FABEROPHYUIl M . p. M~mbtr. Upptr IIm~ston~ about / .0·/ .75 /em northeast of th~ Mucur mining district. Utah. Th~ section tr~nds north~aslward across the north 2. Limeslone. dark gray. weathers light gray to ~nd of hill (elev .. 7.712 ft) sOlllh of Mcadow Canyon. beginning at about II gray. very fine grained. thin to medium bedded. 6.800 ft. contour in th~ SW 114. NW 114. sec. 5. T. 6 S. • R. 3 W. . eastlllard well joimed. britlle. platy and blocky noal 4.0 6.0 across the crest. north of th~ summit. to the low divide in th~ Mtrcur 7 1I2'mjnut~ quadrang/~. Utah. 1. Mostly argillaceous limestone and shale noat. Limestone dark gray. fine grained. thin bedded. [Measured by Mackenzie Gordon. Jr.. and Edwin W. Tooker. August 1980. platy. 6.0 Fossil collections identified by J. Thomas Dutro. Jr. Januaryl997) Total thickness of Silveropolis Limestone measured 260.2 Thickness Distan c, Total thickness of the Great Blue Limestone 763.7 (melers) above ba. (meters) Conformable contnc t Humbug Formation (upper bed only) Manning Canye:, Shale. covered 70ne in shale Quartzitic sandslone. grayish tan. weathers Conformable contact dark brown. fine sand. slighlly banded. thin 10 medium bedded. locally platy. Mereur Limestone Member. Grelt Blue Limestone (481.8 m· thick) 47. Argillaceous and fossiliferous. sandy. and cherty limestones. interbedded; limestones medium gray. weather medium bluish gray. fine grained. thin to medium bedded with occasional irregular fragmental (bioclastic) fossil sand IUId chert nodule layers. fossiliferous; bold outcrops and blocky noat 26. 1 481.8 USGS collnJ. 2798()'PC. 27982·PC. aDd 27986-PC from \his bed where measured on hill on nOM aide of M:adow Caayon USGS coUn. 2791()'PC ARCHIMEDES sp. (bryozoan) Amplniuphrenloid corll. indel. Echinoderm deb.ia. indel. BuxroNIA sp. CLElOTHYRlDlNA sp. MYAUNA ap. Mollusks. indel. 47 48 USGS colin. 27982·PC ARCHlMEUFS .p. Ecinoderm deb,is. inde t. 40. Argillaceous limestone and silty limestone, interbedded; dark gray, weather bluish gray, USGS colin. 27~8 86 · PC fine grained, thin bedded; grayish black chert ARCHIMEDES sp. nodules occur in local pods in brownish-gray 46. Silly and argillaceous limestone, interbedded; weathering silty limestone; platy to blocky float 18.5 375.4 medium gray, weather medium light gray, fi ne grained, thin bedded wit!. fine to coarse 39. Silly and argillaceous limestones, interbedded banding; platy, rounded float fragments with thin cherty limestone layers; limestone is 2.8 455.7 dark grayish-black. weathers medium gray, 45. Sandy and argillaceous limestones, interbedded; fine grained; platy and blocky float among medium dark gray, weather light tannish-gray, scallered oUlcrops 16.0 356.9 thin bed ded; platy f1oat·covered slope 13.4 452.9 38. Sandy limestone wilh interbedded argillac~ous 44. Silty and argillaceous limestones, interbedded; wd cherty limestone layers; dark grayish- silly limestone is medium light gray, weathers black. weathers medium gray, fine grained, thin medium light gray with brownish tint; to medium bedded. locally banded with brownish argillaceous limestone is medium dar" gray, gray-wealhering, coarse sandy laye rs containing gray chert nodules; plalY float, weathers light gray and medium lig~. 1 gray; 34.1 340.9 both are fine grained, thin bedded: section becomes 37. more argillaceous in upper part: platy float on ShaJe and sandy limestones. interbedded; fissile mostly covered slope shale moslly covered; limestone is medium 9.3 439.5 gray, weathers light gray, th in to medium bedded; plaly and blocky f10B t 5.2 306.8 43. Shale; soil-covered shale interval 8.0 430.2 36. 42. Sandy and argillaceous limestone, interbedded; Shale. light gray. weathers same. fine gr:,ined fissile; covered slope dark gray, weathers medium dark gray, fine 1.5 301.6 grained to sandy, local bioclastic lenses 35. and lenses of black chert; locally fossiliferous Argillaceous limeslone, medium dark gray. 3.4 422.2 weathers slightly lighter gray, medium grained, USGS colin. 27996-PC al 6.9 m above base local thin bioclastic debris I.ayers. bellerophontid Chonelld bnchiopod.. inde,. fossils; sparse blocky f10al 2.5 300.1 OVATIA sp. 34. Fossiliferous and argillaceous limestone, inter 41. Argillaceous limestone and silly limestone. bedded; fossil limestone medium gray to d"k interbedded; medium dark gray. weathers bluish gray, weathers dark gray, fine to coarse grained. gray. fUle grained. • thin bedded, including platy, contains some bioclastic layers, very irregularly spaced platy beige siltstone layers; fossiliferous with brachiopod ~ . snails, and fossiliferous 33 408.84 bryozoans. Argillaceous limestone dark gray. weathers medium gray, fine grained, medium USGS colin. 2799S·PC al 31 m (lop or rid",) bedded up to 0.3 m; also locally fossiliferous OVATIA .p. (snails) .:ld bioclastic interbedded layers. blocky float 18.3 297.6 49 50 26. Shale. dark gray. weathers light gray. fi;:~ grained: USGS colin. 27994-PC (mostly nOli specimens) platy float. covered slope Bry010lDJ, indel. (musive) 3.2 230.4 INFl.ATIA sp. Spiriferid brachiopods, indel. 25. Sandy limestone, medium gray, weathers ligbt Benerophonls, indol. gray with reddish-gray tinge. thin bedded containing irregular mud lenses at base; graded 33. Sandy limeslone, dark gray, weathers gray, fine upward into thin to medium bedded with more to medium grained ~ alcarenjte, thin to common mud balls and lenses; upper pan banded medium bedded; mostly covered slope 6.7 279.3 sandy and ftne sandy limestone with dark gray 'lIud lumps; top massive limestone bed is 0.3 m 32. Argillacecus and silty limestone, interbedded; to 1.5 m thick carrying sparse fossils and bioclastic medium Gray. weathers medium blue-gray with sand y lenses 5.9 227.2 tllD bands. fine to medium grained. thin bedded: platy float 3.7 272.6 24. Shale; covered slope 8.7 221.3 31 . Sandy limestone. black. weathers dark gray. 23. Cheny limestone. dark gray to black, weathers dark medium-grained calcarenite sand with fossil gray. medium to fine grained. mediuln bedded. fragments; panly covered 4.5 268.9 contains sparse irregular gray chen nodules; sparsely fossiliferous, bioclastic lenses. brachiopod. coral. 30. Argillaceous limestone and silty limestone. trilobite interbedded; grayish black. weather gray and float 2.6 212.6 brownish. fine to medium grained, irregular banding produced by silty laminae 8.6 264.4 22. Shale and argillaceous limestone, interbedded: mostly covered slope. platy limestone float 4.2 210.0 29. Calcareou ~ siltstone. silty limestone. and shlle. interbedded; shale gray. weathers light gray: silty 21 . Limestone. medium gray to black. weathers dark limestone medium dark gray. weathers brownish gray. medium to thick bedded, prominent leJge tan; calcareous siltstone medium gray, weathers former, fractured and healed with white calcite; tannish gray; flne grained laminae. thin bedded. blocky float 3.0 205.8 banded; platy float. mostly covered 7.7 255.8 USGS colla. 27993-PC in UppetmOSl 0.3 m 28, Shale; covered slope 4.0 248.1 COD"ios mOll abu"wl fossils. Small born co...... i.del. CANlNlA? sp. 27. Calcareous siltstone, silly limestone. and shale. SPIJUFJ!Il BRAZl!IUAN1JS interbedded; siltstone medium gray. weathers INFLATIA d . I Bn..oBATA tannish gray. fine grained. thin bedd- . and laminar. banded; limestone gray. weatners brownish tan, ftne grained. thin bedded; shale 20. Silty and argillaceous limestone. interbedded; dark gray, weathers light gray. thin laminae between gray to black, weathers light gray, siliceous bands thicker limestone and siltstone; mostly covered tan-gray, flne grained. thin bedded and banded, slope with platy float 13.7 244.1 sparsely fossiliferous 21.2 202.8 I 9. Shale, covered zone 7.6 181.6 5 1 52 and lenses of irregular thiclmess 1.3 118.6 18. Argillaceous and silty limestone. interbedded; dark I I . Argillaceous and silty limestones. interbedded; gray. weathers light gray with tan silty bands. fine medium gray. weather in light gray and tan grained. thin bedded; mostly covered slope 2.3 174.0 bands. fme grained. thin bedded with shale intercalations less than IS em thick 8.8 117.3 17. Sandy limestone. dark brownish gray. weathers about same. fine sand. medium bedded. blocky 10. Limestone. grayisb black. weathers medium gray. fragments. interlayered thin bioclutic sandy lenses; more si.1iceous thin layers weather brownisb. fine panly covered slope 1.1 171.7 grained. thin and medium bedded; partly covered 6.8 108.5 16. Silty timest.one. dark gray. weathers light gray. 9. Limestone. grayisb black. weathers medium gray. fine grained. medium bedded. br.:aks with more sandy beds weather tan. medium grained. conchoidal fracture. contains thin interbed(.ed thin to medium bedded. irregular cben layers in sandy limestone with fossil hash beds 3.4 170.6 upper part. locally fossiliferous poor preservation; slope mostly covered 38.7 101.7 IS . Limestone. medium grayish black. weathJ!rs medium light gray. fmc grained. thin tt' medium USOS coUn. 27917 at 12.3 m bedded and massive. locally argillace'Jus and Bry010lD.. indel. platy; fossiliferous in morc argillaceous beds. echinoderm debri.. indel. Chonetid brachiopod.. iadel. bryozoa (4 types). crinoids. FLEXARIA brachiopods FLIlXARJA? .p. and trilobites 27.3 167.2 8. Shale and siliceous limestone. interbedded; shale USOS colin. 27988·PC at 12.2 m above base Bryozoan.. iadel. (mu.ive) medium dark gray. more siliceous beds weather Ech inoderm debri.. indel. tan. calcareous beds weather light gray. fine Fl.£XARlA? 'P. grained. thin bedded to fissile; covered slope 1.5 63 .0 Trilobite (,.,menll. indel. 7. Argillaceous limestone. medium gray. weatbers 14. Chen and limestone. interbedded; ehen medium mottled medium ligbt gray. fine grained. thin to dark gray;. weathers medium gray; limutone dark bedd ~d. sparsely fossiliferous locally. bell",ropbontids gray. banded. weathers gray and tannish gray and brachiopods. indot.; blocky and platy 110at 9.9 61.5 in more siliceous layers. sligbtly fossiliferous. crinoid stems 7.8 139.9 6. Limestone. grayish black. weathers medium g ra ~' ; fme grained. thin bedded; siliceous zones weather : 3 . Argillaceous and silty limestoae with chen. brownisb 1.8 51 .6 interbedded; limestone dark gray. weathers medium gray; cben blac~ weathers tannish S. Limestone. dark gray. weathers medium to dark gray; fine grained. thin bt:dded; platy float 13.5 132.1 gray. ftne grained. medium bedded. massive outcrops 7.3 49.8 12. Chen and limestone. interbedded; chen gray. weathers tannisb gray. lisegang ring structure; 4. Silty limestone and sandy limestone. interbedded; limestone gTayish-black. weathers medium gray; silty limestone dark gray. weathers brownisb tan; fine grained. medium bedded cben occurs in layers fine to medium grained. thin beds 0.3 to 0.6 m 53 54 thick; platy, silty, and blocky sandy li mestone fl oat 4.7 42.5 3. Limestone and argillac~ous limestone, interbedded; gray black, weathers ligbt gray; fme gra.ined, thin ------bedded to platy; banded, more laminar above J 1 Bingham 16.1 m; broken fossils in float; mostly covered I Ophir s lope 155 37.8 I : 2 I /3 Mercur 2. Siltstone and chert, medium gray, weathers light I I ~------,- brown to tan, pllty It base, becomes laminar and L ..:: ::-=:: Salt... Lake City. blocky at top; nodular cherty limestone and chert I I !NiH!? ...... " interbedded, thin bedded; 2.4 m clifty outcrop, I :: ~ : ::: : . " at base; at top. brown-weathered chen shows ", Iieseglllg structure I , 10.0 22.3 I , I , 1. Cherty limestone, dark gray, weathers medium gray I , black eben zones weather brownish gray, fme to I I medium grained, 5 em to 0.6 m thin to massive eliff I , forming bed, banded appearance, fragmental I , I , belleloophontids, indet.; blocky float 12.3 I , TotR' thickness of the Mercur Member measured 481.8 I I, Conformable contact t Long Trail Shall:, middle member of the Great Blue Limestone ------Figure I. Index map showing the location of the Bin&bam. Opbir, and Mercur mining districts in the southern Oquirrh Mountains, Utah SPU.RR (1895) GILLULY (1932) THIS REPORT IIercur Southern Oquirrh Mountains Ophir UPPER SHALE 30 m GREAT 762 m UPPER UMESTONE ercur Umeslone 470 m BLUE · LIMESTONE ------~------r_------LOWER SHAlE 8 m LONG TRAIL SHALE 26 m Long" rul Shale 3S m SllveropoliS 305 m LOWER UMESTONE 152 m L1meslone 260 m FilVC 2.. !vollllioa or the .lta1icrapllic: oomeoc:lalure (or the ORal Blue IJmaloao and the coalormable eoc:Josioi (ormatioos in the Oqll1nta MouWu lype localhy. 56 57 r------~ Shale Member ~~;';:i.;";;-~~." la-pc -- ,...... ,.--,...... Explanatlon ..,,,-,-- ffi E~::II:~: al .- .:· .. .:. SI (ldy L1me.lone, :E Ch.rty Llmuton. w - _ Sh.ly L1mntone :E Shll. ... iiiii- 2118421183·PC-PC 27320-PC27321·Pt: I w l z 0 1~~I~~-2 11 82.PC 2732S·PC I- 100 en w -- :E ::i E 0 (/) (0 ::i C'oI 50 0 21181·PC 27324·PC 1~~iii~~ -62F3S1 C. t:;:~=!=1::::!:l 2118o-PC 0 a: w > o 27323·PC ..J meters en ~ii~~~;u~m~b;~9 Formation ' I I DI Figure 4. Ol. grammatic IlrItiaraphic section of the Silveropolis '-----'---'-----" li mestone member of the Great Blu. Umellone nelt Ophi r, UIlII. Fi,ure 1. Gcolo,ic sClI in, in Inc Olnih:a m nlppe: In 'he southem Arrows on the lert sid. sepmt. three typical conformable Oqu ird. MCKl nlllns. Ulah . 1nd the 1 ~ )IIOfU of the Grul Blue subunhs dcscribtA in the lell. Numbers on the rigbt side indic. ", L,mutonc type and rderence ",cJlI. :cd seelio", (shown as Ihe .he location of USGS foss il collections described in Ihe append;" heav)' duhcd lines A arr.d U) Shalt 59 50 ..emb er LONG TRAIL SHALE MEMBER ' 33 m section o offset meters ""we Jll'ff,i,~n#c SU"eropol/'I Umutone " ember ""'.f'C tn ....c tJJ.J.J.#C Figure 5. Diagrammatic skaligraphic section of the Long Trail 100 Shale (member) of tbe Great Blue Limestono near Ophir. Utah. Numbers on the right side indicate the location of USGS fo sil MERCUR LIMESTONE MEMBER collections described in the appen -u,.we o meters ann·'c .-..c: M. mber FIaurt 6. Dia,rammltie stratiaraphie section or th. Mereur limeslone member or Ihe Grtll Blue Limeslone nel! Ophir, Ulah. Arrows on Ihe ten side seplRle rour Iypical conrormabte subunils described In Ihe 1•• 1 . N.mbers on th. ri&hl side indiule Ihe IOCllion or USGS rossll colleclions described in Ihe . ppendi • . r------____ ~60 Great Blue Limes one Ophir, Utah F ssil Faunal cOilns. Age 4" zones series -- Mereur s.~ braztClanoY$ UIINe 1" IIIIt~ul~.... offset Limestone 1 m~ - 'M Member Canjnia a:: llleN'C w t 470 m V) W :r ...... • . ' , Sliveropolfs ...... --J II~IC ~~- 16 S or Mame limestone II II 'I Member II ;'! II 260 m 111"« II 11l9N'C ,I 1II1W'C ~or Mame tJ LJilij-FaberOPhYIIUm W -~ Figure 7. Oi grammatic stratigraphic section of the Mercur limestone member of the Great BLue Limestone near Ophir. Utah. Arrows on the left side separate four typic.J conform ble subunits described in e te~t. Numben on the right side indicate the location of USGS fossil collections described in the ppendix. 1 2 3 4 5 WASATCH N.OQUIRRH s.OaUIRRH STANSBURY E. TINTIC ' IW" ' W Pe RV MISS· . "0 ' .v• •. ' • .. H "'-: •