LateCretaceous (Lancian) from the McRae Formation,Sierra County, byRichard P. Lozinsky, Adrian P. Hunt, and Donald L. Wolberg,New Mexico Bureau of Minesand Mineral Resources, Socorro,NM, and Spencer G Lucas,University of New Mexico, Albuquerque, NM

Introduction prospectinghas yielded additional - in the Cutter sag and Jornada del Muerto Identifiable skeletal elements of Late Cre- bearing localities(Fig. 1). In this paper we (Fig.2). Bushnell(1953, 1955) recognized two taceous dinosaurs are known from three for- describethe dinosaurand -plantoccur- McRaemembers, the lower JoseCreek and mations in New Mexico: the Fruitland rences,we review previous studies of the the upper Hall Lake, and he suggestedthat Formation and Kirtland of the SanJuan McRaeFormation, and we discussthe ageof the McRaeFormation may approach1,000 m Basin, and the McRae Formation in and the McRae and its oossible correlation to in thickness(Fig. 3). Becausepart of the sec- around the Butte Reservoir area. stratigraphicunits in the WesternInterior. tion is submergedbeneath the waters of El- This is the second published description of eohant Butte Reservoirand becauseof dinosaur remains from the McRae Forma- McRae Formation pronounced faulting, measurement of a tion. The first report was published by Lee Although recognizedas a discretestrati- completesection is not possible. (1905). Recent discoveries of McRae dino- graphic unit since the early twentieth cen- The fose Creek Member restsunconform- saurs began in 1981when Lozinsky observed tury (e.g., Lee, 1905,1.907), the McRae ablvuoon rocksof the MesaverdeGroup and the presence of dinosaur-bone fragments Formation was first named by Kelley and consisisof a sequenceof ,shale, duriig geologic studies in the Elepharit Butte Silver (1952).This unit consistsof a thick se- conglomerate,and an unusual brecciacon- area (Lozinsky, f982). Subsequent fossil quenceof nonmarine clasticrocks exposed glomerate (Bushnell, 1953;Lozinsky, 1982, 1984).This memberis 120m thick at its type locality. The Hall Lake Member conformablyover- lies the JoseCreek and is distinguished by its abundanceof purple and maroon . The boundary between the two membersis marked by a basalconglomerate. When the conglomerateis absent, the boundary is marked by the first purple or maroon shale. The top of the Hall Lake Member is absent in all areasand is unconformablyoverlain by variousCenozoic units.

Paleobotany Megascopicplant remainsappear to be re- stricted to the JoseCreek Member and are most common in the finer grained sand- stonesand siltstones.Fossil leaves also have been reported from the underlying upper CrevasseCanyon Formation (Table 1; Loz- insky, 1982;Wallin, 1983). Despite difficulties that arisefrom comparing CrevasseCanyon and fose Creek fossil floras to floras else- where, the assignmentof a Late age to the CrevasseCanyon and McRae is consistentwith available data as indicated below. In addition to fossil leaves,abundant pet- rified wood fragments and occasionalfrag- mentary logs and in situ stumpsoccur in the JoseCreek Member. Some of the stumps are of substantialsize ( t 1 m in diameter)and appearto be in growth position.

Vertebratepaleontology Lee (1905)reported dinosaur bonesin rocks at or near Elephant Butte. Two additional collectionswere made in the areaduring the next eight (Kelley and Silver, 1952), and these were referred to the cera- topsian genusTricuatops by I . W. Gidley (Lee, 1907;LulI,1933). The fossilmaterial collected during the 1905-1913period was included in the collectionsof the U.S. National Mu- seum. Today, this material consists of two FIGURE 1-Generalized geologic map of the Elephant Butte Reservoir area; dinosaur-bearing localities dinosaur vertebral centra and other bone are highlighted in blue.

November 1984 Nm Mexico Geology -

o _c. C) ()3 o .9 a

FIGURE4-Anterior viewsof USNM2437 (x tlz\, t- dorsalcentra referred to ,possibly by S\8 J. W. Gidley (Lee,1907; Lull, 1933;bar is 10 cm long).

USNM 2437 collection contains no cranial + material and cannot provide a realistic basis 6ptslr'7:\ \ for generic identification. However, the two centra of USNM 2437 are large and within i*l \te\ s\ the size range of Triceratops(Hatcher and others, 1907,pl.8). ,a Late Cre- taceousceratopsian as large as Triceratops,is known only from cranial remains (Colbert and Bump, 1947).It is not possibleto deter- mine whether USNM 2437rcpresentskicer- / o 25mi ntops,Tbrosaurus, or a new ceratoPsiantaxon. ', - Between1913 and 1981no dinosaurfossils o 25km were collected from the McRae Formation, although no less than seven geologic map- FIGURE 2-Tectonic setting of the Elephant Butte area. Hatched lines are normal faults with hatchures ping projects included the McRae (Doyle, on the downthrown side; the lines are dashed where faults are buried or inferred. Solid lines delineate 1951;Kelley and Silver,1952; Bushnell, 1953; major uplifts (after Woodward (1982, and others, 1978).Shaded portion is the area coveredby Lozinsky 1951; Melvin, 1984). McCleary,'1960;Thompson, 1.963;Warren, 1978).However, in 1968,John Hawley and William Seager(now at the New Mexico Bureau of Mines and Mineral Re- sources and New Mexico State University, TABLE 1-CnEvessl CaNvoNeNo Iosr Cntlr ruones respectively) were notified of a partial cer- atopsianskull discoveredat a time of a very TOP ERODEDAND NOT Taxa Rock unit Butte Res- SEEN,OVERLAIN BY low water level in the Elephant this locality has not - JoseCreek Member Geinitziacf. formosa ervoir. Unfortunately, (r of McRae ?Cannamagnifolia been exposedsince then. BASALTFLOWS AND Formation Sabalmontana The studies initiated bv Lozinskv in 1981 F ALLUVIUM (Bushnell, 1953; Plryllitescf. ratonensis E, haveresulted in the discoveryof l2"localities lrl Kottlowski, et al., Salixsp. (Fig. 1) that have yielded fossil matedal rep- 1956;Lozinsky, sp. F Cinnamomum taxa(another locality 1982) Sequoiasp. resentingfour dinosaur lies just outside the map area to the north). ro HALL LAKE Seauoiareichenbach: tr) Sabatitessp. Additionally, in 1983 a yachtsman discov- o, -zJSBEf-r-'(-884m) ' Sabalitesmontana ered a locality on the east bank of the res- Ficusplanicostata ervoir that yielded an incomplete jaw of (D C Ficustrinerius Tyrannosaurusrex. This very significant spec- E o Viburnummarginatum imen is in the collections of the New Mexico Araucar it es longifo lia Museum of Natural History and has been made available to us through the courtesy of a CrevasseCanyon Sequoiamontana recognized its sig- l Formation Ficusolaniostata David Gillette, who first o nificance.A detaileddescription of this spec- lrJ (Lozinsky, 1982; cf . Dryophyllum sp. o ASH CANYON Wallin, 1983) cf . Inurophyllum wardiana imen will be undertaken by the New Mexico MEMBER(24O m) cf . Dillenitescleburn: Museum of Natural History and the New F rO UJ @ Cercidiphyllumsp. Mexico Bureau of Mines and Mineral Re- E. () BARRENMEMBER cf. Quercusaiburnit'olia sourcesin a separatepaper. i fossilsprobably camefrom low ( 328 m) THE USNM in the Hall Lake Member. Localities discov- 3 -BEARING fragments,all cataloguedas USNM 2437.lt ered recentlyoccur at or near the boundary MEMBER(137 m) is likely that thesespecimens are all that re- between the Hall Lake and JoseCreek Mem- main of the 1905-1913collections. Figure 4 bers.Fossil bone is often associatedwith con- shows the two centra that have been referred glomeraticor shaly beds. Discussionof the FIGURE 3-Generalized stratigraphic column for to Triceratops. most significant specimens found by us fol- the Elephant Butte area based on Lozinsky (1982, Current criteriafor defining ceratopsiantaxa lows. 1984)and Wallin (1983). are basedmainly on skull characteristics.The

New Mexico Geolo3y November 1984 FIGURE5-TKM001, dorsaltheropod centrum:(A) anterior,(B) lateral,and (C) dorsalviews; TKM007, sp. humerus: (D) anterior and (E) posterior views; TKM002, ceratopsiancoronoid process:(F-G) lateral views; TKM020, ceratbpsiancrest fragment:(H) dorsaland (I) ventral views; TKM01l, ankylosaurarmor fragment:(f-K) lateraland (L) basalviews. The solid bars are all 5 cm in Iength exceptD-E, which is 10 cm.

November7984 NewMexico Geology Centrum TKM001(Fig. 5, A-C) is an incomplete,but relativelywell preserved,dorsal centrum. It is strongly opisthocoelousand ovoid in out-

preserved anteroventrally, but it is likelv to have been similarly devetopedand to have {ormed a deep concavity between the two lipJike structures. The strongly opisthocoelouscharacter, rel- atively large size, presence of a pleurocoel and secondaryforamina on the pedicelsof the neura! arch, and the excavaiednature betweenanterior and posterioroverhanging FIGURE6-Sauropod femur (TKM009), still partially encasedin sandstone of the fose Creek Member lips lead us to believe that TKM001 re-prel matrix,is more than 168cm long. sentsa large theropod, possibly a tyranno- still saurid. partially encasedin matrix, extendsdi- Ceratopsian crest fragment TKM020 (Fig. 5, H-I) is a bone fragment Humerus 125mm x 115 mm that varies in thickness from 34 mm at its broken edge to 8 mm at an almost intact margin. The cortex is can- cellous and bounded above and below by dense, laminar bone. The surfacesof th-e representsa sauropod.The most reasonable fragment are slightly concave and slightly hypothesisis that this specimen be referred convex, respectively. Both surfaces exhibit to Alamosaurus.However, there is a strong narrow linear and arcuate grooves, inter- at the humeral head and extendsin an arc tendencyto refer records Late of Cretaceoui preted as impressionsof blood vessels.Based North American sauropods to Alamosaurus on these features and comparison with ma- without real justification. Apart from the terial availableto us, TK1vi020represents a forelimb described by Gilmoie (1946), little fragment from a ceratopsiancrest. Given the is known of the apendicularskeleton of Ala- thickness of this fragment it is likely that it camefrom a large individual.

Ankylosaur armor TKM011 is a pyramidal, laterally com- pressed bone fragment 75 mm long, 45 mm wide, and approximately sanjuanensis,known from the Naashoibito Ceratopsiancoronoid 70 mm high (Fig. Member of the Kirtland Shalein the SanTuan 5, J-L). A central and roughly circular medial foramenis Basin (Gilmore, 1922),the JavelinaForma- presentin its base. tion of (Lawson, 1976),and the lower This specimen, although poorly pre- part of the of served,almost certainlyis a fragment of an- (Gilmore, 1945).The deltopectoralcrest of kylosaur armor, more specifically a TKM007 is less massivethan that of Alamo- compressedconical plate (Co6mbs,nZAl. n saurusand is not asmedially deflected.How- is virtually identical to an ankylosaur plate ever,Gilmore (1946)notes-that the extent of in the University of New Mexico collections the medialdeflection seen in the North (UNM-FKK-001P) from the Lancian Naa- Horn summit is rugose and the anterior coronoid specimen has been exaggeratedby lateral shoibito Member of the Kirtland Shale. margin curves up and forward into an an- crushing. specimen-is tentatively Our current interpretation of the compo- .This re- teriorly_directed, hook-like process.A deep ferred to Alamosaurussp. sition of the McRae is shown in Table cavity for the reception of the surangular is 2. presentat the posteriorof the Femur coronoid.These featuresare sufficient to demonstratethe cer- Age of the McRae Formation TKM009 is a massiveleft sauropodfemur atopsian nature of TKM002. Although it is Controversyand misconceptionhave sur- (Fig 0) that is at least 168 cm long and 46 not possible to differentiate between Tricer- rounded the question of the age of the McRae cm wide proximally. The specimenwas found atops and Torosaurusbased on the material Formation and of its relationships to other in a thoroughly silicified pebbleconglomer- available,the coronoid is much more mas- formations in the Western Interior. Table 3 ate and is still in the field. sive and not as high as the coronoid in Pen- summarizesthe changing concepts. The shaft is straight and the proximal head, taceratoos. re

NewMexico Geology November 1984 TABLE 2-CovposrrroN oF THEMCRAE FAUNA the only means for narrowing the minimum age for the McRae Formation. The presence Class Reptilia of Tyrannosaurusrex (the NMMNH speci- SubclassArchosauria men), a large theropod (possibly a tyranno- Order saurid), severallarge ceratopsianspecimens Suborder (early Infraorder Cainosauria (TKM001) reports, the Hawley skull, our collec- Familv Tvrannosauridae tions), and a titanosaurid referred by us to Tyrinnosaurusrer (New Mexico Alamosaurusis strongly, if not conclusively, Museum of Natural History jaw) in favor of a Lancian age for the McRae For- mation. Infraorder (TKM009) The Lanciandinosaur fauna from the North Family Titanosauridae Horn Formationdescribed by Gilmore (1946) G enus Al amo snur u s (TKJ|/1007\ contains Tbrosaurus,Alamosaurus, and Tyr- Order annosaurus(Lawson, 7976).The Naashoibito Suborder (TKM011) Member Suborder of the Kirtland Shalealso contains Family (USNM 2437, these three genera (Gilmore, 1922;Lehman, TKM002, TKM020, Hawley L981;Lucas et al. (pers. comm. 1983).Al- specimen) though Lancianin age, these do not contain Triceratops.As we have shown, it is not possibleto determine whether the McRae CRETACEOUSDINOSAUR FAUNAS The youngest diagnostic fossil that occurs ceratopsianis Triceratopsor Torosaurus. below the McRaeis Lophasannionis, found in Sloan(1970) proposed the conceptof a bio- the (Wallin, t983). L. san- geographical dichotomy of Maestrichtian FIGURE7-Geographic distribution of the latest nionis ranges from late to early terrestrial communities in the Western In- Cretaceousdinosaur communities in North Amer- ica (afterSloan, 1970). (Hook and Cobban, 1981).How- terior of . The "Triceratops ever, the Gallup strata are separatedfrom the community" of Sloanwas dominatedby Tri- McRaeby at least 700m of intervening strata ceratops,Anatosaurus, Torosaurus, and Tvran- ence of the Alamosaulrs community in the of the CrevasseCanyon Formation (Wallin, nosaurus.This community extended as far McRae leads to the conclusion that at least 1983).In the San fuan Basin, the Crevasse south as north-centralColorado (Fig. 7). A the upper part of the CreekMember and Canyon contains early Coniacian southern "Alamosauruscommunity" was Jose the lower portion of the Hall Lake Member (Tschudy,t976) and may extend up to the characterizedby the presenceof Alamosaurus are Lancian in age. Becauseapproximately mid-(Molenaar, 1983). Marine de- andTbrosaurusin addition to the persistence 850 m of the Hall Lake Member overlies the posits associatedwith Molenaar's T-4 of more archaic hadrosaurs (Sloan, 1970). dinosaur-bearingrocks, it seemsreasonable transgression terminated Crevasse Canyon Basedon recentdiscoveries, it now appears to infer that the upper portion of the Hall deposition in the San Basin, but this that the Tyrannosaurusis present in the AIa- |uan Lake Member is at least early Paleocenein transgression did not reach Sierra County, mosauruscommunity as well. a8e. New Mexico (Molenaar,1,983, fig.2). There- The presence of the Alamosauruscommu- Based on extant collections, the presence fore, no upper agelimit canbe placedon the nity in ihe McRaeFormation of south-central of Triceratopsin the McRae Formation cannot CrevasseCanyon Formationin the Elephant New Mexico ties together the other reported be demonstrated, and we cannot exclude the Buttearea based on regionalcorrelations. An occurrencesof this community: the Javelina possibility that the ceratopsianpresent is To- age substantiallyyounger than mid-Santon- Formation of west Texas, the Naashoibito rosaurus.Indeed, given the known distri- ian is quite possible. Formation of the San Basin, and the |uan bution of these ceratopsiansand Sloan's At present,paleontological evidence offers North Horn Formation of Utah. The pres- community concept, it is more likely that To- rosaurusis the ceratopsian present in the TABLE 3-Svr.ropsls oF CHANGINGcoNcEprs oF THE AGE or rnr McR-lr FonveloN. McRae.If future collecting demonstratesthat Triceratopsis present in the McRae, Sloan's UPPERCRETACEOUS community concept would have to be mod- ified, but the probable age relationships of the McRae to other stratigraphic units would remain unchanged. Fig. 8 shows our pro- WILPOLTAND posed correlation with units elsewhere. (I95I) WANEK ACKNOWLEDGMENTS-Theauthors wish to thank Mr. and Mrs. Ival Kennedy and Mr. SILVER(I955 and Mrs. EarleGeorge, Elephant Butte, New BUSHNELL(1953) Mexico, for their courtesy and kindness; we thank TennecoOil Company for accessto the PedroArmendaris Land Grant, the U.S. Bu- KOTTLOWSKI(I953) reau of Reclamation for accessto Elephant Butte Reservoir,Coleman Robison, Getty Oil (I955) SILVER Company, for identifications of paleobotan- KOTTLOWSKI ical material, David Gillette, New Mexico Er AL.(t956) Museum of Natural History, for the loan of KOTTLOWSKIAND the McRae Tyrannosaurusrex iaw, and Nicho- BUSHNELL(I954) las Hotton III for accessto the U.S. National Museum collections from the McRae. This manuscript was read by David Ber- man, Carnegie Museum of Nafural History, LUCASAND Mexico Bureau of Mines INGERSOLL(I98I) and firi Zidek, New and Mineral Resources.We appreciate their helpful suggestions. Drafting for this paper was done by Teresa Mueller. The research

November 19M New Mexico Geology reported in this paper was supported by the UnpublishedM S thesis,University of New Mexico, New Mexico Bureau of Mines 742pp and Mineral -, Resources,Frank E. Kottlowski, 1984, Geology and late history of the Director. Elephant Butte area, Siena County, New Mexico: New Mexico Bureau of Mines and Mineral Resources,Cir- cular 187,40 pp Lucas,S G, and Ingersoll,R V, 1981,Cenozoic conti- References nental deposits of New Mexico-an overview: Geolog- ical Society of America, Bulletin, v 92, pp 917-932 Bushnell,H. P, 1953,Geology of the McRaeCanyon area, Lull, R S , 1933,A revisionof the Ceratopsiaor horned SienaCounty, New Mexico:Unpublished M.S. thesis, dinosaurs:Memoirs of the PeabodvMusium of Natural University of New Mexico, 105 pp History,v. III, pt 3. 175pp -,1955, Stratigraphyof the McRaeFormation: Com- McCleary, I T , 7960,Geology of the northern part of the pass,v.33, pp 9-17 Fra Cristobal Range,Siena and Socono Counties, New Colbert,E H, and Bump, J ,1947, AsktllofTorosaurus Mexico:Unpublished M S thesis,University of New from South and a revision of the genus: Pro- Mexico,59 pp, ceedings of the Academy of the Natural Sciencesof Melvin, J W., 1963, Cretaceousstratigraphy of the Jor- Philadelphia, v 99, pp. 93-106 nada del Muerto region including the geology of the Coombs, E P.,lr , 1978,The families of the ornithischian Mescal Creek area: Unpublished M S thesis, Univer- dinosaur order Ankylosauria: ,v 21,,pp sity of New Mexico, 121pp. 1.43-170. Molenaal C. M., 1983,Major depositionalcycles and re- Doyle, J C , 1951,Geology of the northern CaballoMoun- gional conelationsof Upper Cretaceousrocks, south- tains, Siena County, New Mexico: Unpublished M.S. ern ColoradoPlateau and adiacentarea; ln thesis, New Mexico Institute of Minine and Technol- paleogeographyof the west-centralUnited States:Rocky ogy,5l pp Mountain Section, Societyof EconomicPaleontologists Gilmore,C.W ,7922,A new sauropoddinosaur from the and Mineralogisls, pp. 201-224. of New Merico: Smithsonian Seager,W R , 1981,Geology of the OrganMountains and MiscellaneousCollections, v.72, no. 14,9 pp. southernSan Andres Mountains, New Mexico:New -, 1946,Reptilian fauna of the North Horn Forma- Mexico Bureau of Mines and Mineral Resources,Mem- tion of cenhal Utah: U S. Geological Survey, Profes- oir 35,97pp sional Paper 210, pt. C, pp.29-53. Silver, C , 1955,Geology of ihe : New Hook, S C , and Cobban, W. A , 1981, Sannionis- Mexico GeologicalSociery guidebook to 5th Field Con- common Upper Cretaceousguide fossil in New Mexico: ference,pp 146-154 New Mexico Bureau of Mines and Mineral Resources, Sloan, R E , 1970,Cretaceous and Paleoceneterrestrial A_nnualReport, July 1.,1979to June30, 1980,pp 52- communitiesof western North America: Proceedinqs JO. of the North American PaleontologyConvention, p1. Kelley,V. C., and Silver,C.,1952, Geology of the Caballo E, pp. 427-453. Mountains, with special reference to regional stratig- Thompson,S., ill, 1,961,Geology of the southernpart of raphy and structure and to mineral resources:Univer- the Fra Cristobal Range, Sierra County, New Mexico: sity of New Mexico, Publicationsin Geology,no 4,286 UnpublishedM.S thesis(revised), University of New NewMexico Geology PP Mexico, 75 pp. Kottlowski, F. E., 1953, Tertiary-Quaternary Tschudy,R, 1,976, of CrevasseCanyon and of the Rio subscriptions Grande Valley.insouthern New Mexico: New of , New Mexico: Mexico GeologicalSociety, Guidebook to 4th Field Con- New MexicoBureau of Mines and Mineral Resources, terence,pp 7M-1,48. Circular 154, pp 48-55 All paid subscriptions to Na?, Mexico Kottlowski, F E , and Bushnell, H P., 1954,Late Crera- VanValen, L.,7969, What was the largestdinosaur: Cop- Geologyend with this issue. A renewal ceousand early Tertiary outaops of Jomadadel Muerto, eia, no. 3, pp.624-626. envelopeis provided here for 1985cal- New Mexico Geological Society of America, Bulletin, Wallin, E. T., 1983,Stratigraphy and paleoenvironments endar- subscriptions.The price is v 67,p 768 of the Engle coal fieldl Sierra County, New Mexico: Kottlowski,F. E., ,R. H., Thompson,M. L., and UnpublishedM.S. thesis,New MexicoInstitute of Min- still only $5.00 for four issues. Return Foster,R. W., 1956,Shatigraphic studies of the San ing and Technology,1,27 pp the renewalenvelope and your checkby Andres Mountains: New Mexico Bureau of Mines and Wanen, R C , 1978,Characterization of the lower crust- the end of December1984 in order to Mineral Resources,Memoir 7, 132pp. upper mantle of the Engle Basin, Rio Grande , from avoid interruption of your subscription. Lawson, D., 7976, and' Torosaurus, Maas- a petrochemical and field study of basalts and their hichtian dinosaurs from Trans-PecosTexas: Journal of inclusions:Unpublished M S. thesis,University of New New Mexico Geological Society Paleontology,v.50, pp. 158-154 Mexico,155 pp. (NMGS) members who pay their 1985 Lee,W T., 1905,The Englecoal field, New Mexico:U.S Wilpolt, R. M., and Wanek,A. A., 1951,Geology of the dues will receive Nao Mexico Geology GeologicalSurvey, Bulletin 285,240pp. region from Socorro and San Antonio east to Chupa- -, magazinefree in 1.985.Reprinted below 1907, Notes on the of the Rio Grande dera Mesa, Socono County, New Mexico:U.S. Gbo- region in central New Mexico: Journal of Geology, v logicalSurvey, Oil and Cas Investigations,OM-121. is the NMGS announcementabout this ls, pp 52-s8. Woodward,L. A , Callender,J. F., Seager,W R., Gries, changein policy (NMG, v. 6, no. 3). Lehman, T., 1981,The Alamo Wash local fauna: A new J. C, Shaffer,W L, and Zilinski,R E, lg7\,Tectonic The memberspresent voted to in- look at the old Ojo Alamo fauna; in Lucas, S G , et al map of the Rio Grande rift region in New Mexico, Chi (eds.), Advances in creaseactive and associatemember San Juan Basin Paleontology,pp. huahua,and Texas;in Hawley,J. W. (compiler),Guide- 789-221. duesto $10and student member dues book to the Rio Granderilt in New Mexicoand : to beginningin 1985and to provide Lozinsky,.R.?., 1982,Geology and late Cenozoichistory New MexicoBureau of Mines and Mineral Resources, $6 of the memberswith a subscription Elephant Butte area, SierraCounty, New Mexico: Circular163, sheet 2, scale1:1,000,000 tr to Nera MexboGeology at no additionalcost. The executivecommittee decided to begin charging1985 rates for duesat SANJUAN ELEPHANTBIGBEND the 1984fall field conferenceand to UTAH MONTANA considerthose who ioin at theconfer- BASIN BUTTE TEXAS encemembers for both 1984and 1985. BLACK j Therefore,you can obtain your 1985 lr, LEBO z NACIMIENTO\\ N\\ L subscription to Neut Mexico Geologyby lrJ NORTH MEMBER enclosing the regularsubscription (J HALL z $6.00, o j price, in the renewal envelope or en- lrJ HORN FORMATIONl! z J LAKE close$10 to (or continue member- FORMATION l TULLOCK ioin f, UJ MEMBER F MEMBER ship in) NewMexico GeologicalSociety. CJO ALAMOSS E L If you already paid NMGS dues at the o F I fall field conference(October 12-15,l9U, lrJ \.IAASHOIBITO HELLCREEK a in Taos)or if you paid your dues since ()E, Y MEMBER JOSECK.ME FORMATION +2* then, you will receive Neut Mexico Geol- o8y automatically for the calendar year FIGURE8-Proposed correlationof the McRaeFormation with rocks found elsewherein the Western 1985. Interior.

Nau MexicoGeology November 1984 77