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(U3&") Correlation of Arizona Paleozoic Formations

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(U3& S70YANOU) (U3&") BULLETIN OF THE GEOLOGICAL SOCIETY OF AMERICA VOL. 47, PP- 459-540. 1 PL., 5 FIGS. APRIL 30. 1936 um. CORRELATION OF ARIZONA PALEOZOIC FORMATIONS BY A. A. STOYANOW CONTENTS Page Utawriedgmaito «0 :::::::::::::::::::::::::::::::::::::::::::::::::::::: J® (V»brian . North-Central area 462 Southeastern area in general 465 ** Bisbee-Tucson sub-area 466 Bolsa quartzite, Pima sandstone, and Cochise formation 466 , Abrigo formation 467 rV Copper Queen limestone 469 Y: Rincon limestone 471 5 Tucson-Globe sub-area 472 m Relation of the Apache group to the Cambrian 472 Troy quartzite 474 Santa Catalina formation i 476 Abrigo formation 476 Peppersauce Canyon sandstone 476 if Clifton-Morenci district 478 jf Correlation 479 'OrdoTician 481 Dos Cabezas Mountains 481 . Clifton-Morenci district 483 Jan.. 484 T General statement 484 Southeastern area 486 "§, General statement 486 Picacho de Calera formation 488 % Lower Ouray formation 489 •j| Remarks 492 orth-Central area 495 | General statement 495 Jerome formation 495 £ Island Mesa beds 500 t| Mt. Elden section and Temple Butte limestone 500 Grand Wash Cliffs and Music Mountains 504 "ppian. 505 P«»eral statement 505 ' &utheastern area 505 Escabrosa limestone 505 ^Paradise formation 508 Clifton-Morenci district 511 iv' (459) LATION OF ARIZONA PALEOZOIC CAMBRIAN 467 TCSON SUB-AREA is 165 feet in thickness, and the thickness of the entire Cochise e, and Cochise formation.—At ^^tion in the Whetstone Mountains is 311 feet. jcson sub-area, is the Bolsa >bbly grits, and cross-bedded, vitrei Abripo formation.—In the type locality at Bisbee, the Abrigo has been a total thickness varying from 430 terized by Ransome as "thin-bedded impure, in part shaly, in part t,cho de Calera Hills, 25 miles west 'k^^eous very cherty dolomitic limestone. Carries Middle Cambrian s Pima sandstone, a buff, hard sane Bed of white quartzite about 8 feet at top."17 The thickness is rtzite in places. This sandstone on as 770 feet. The age was determined by Walcott, on the basis of >re than 60 miles, from the Whet . paleontologic material collected by Ransome. No species names, o the Picacho de Calera Hills Pi Jjowever, were given in any of Ransome's publications. Later, Walcott {Iphidella) pannula (White), jjted the following brachiopods from the Abrigo: Obolus tetonensis Wal- id the Abrigo is the Cochise formatio jott and Obolus zetus (Walcott).18 In a still later paper, a cranidium ne Mountains, it consists of three tad a pygidium of Crepicephalus texanus (Shumard), found in the Moore re pink and reddish, thin-bedded BE (janyon near ^Bisbee, are mentioned.19 follow 116 feet of yellow, pink, grtj Obviously, the part of the Cambrian limestone of Bisbee that contains i, which in the upper horizons alter ^Obolvs zetus is older than the beds with Crepicephalus texanus. Although ubbly limestone. Brachiopods, inchlj ®o Middle Cambrian trilobites have been found in the Bisbee area thus is (Walcott) in some abundance, litt the "algal" limestone so characteristic of the Cochise formation is raulos n. sp.) have been found in present in the Escabrosa Ridge west of Bisbee. pper division is characterized by b{ The base of the Abrigo formation is marked by the sudden appearance estone, rather grayish, brownish, Crepicephalus texanus (Shumard) and Hesperaspis butleri n. sp., the igher in the section, the blue limest ^ int-named form persisting throughout the entire formation, the second IOUS. Within the lower part of the bl gly restricted to its basal layers. So characteristic is the presence rith them, are thin-bedded, calcarec |IHe&peraspis butleri at the base of the Abrigo that in every Cambrian Neolenus intermedins pugio Wale jllcrop in southeastern Arizona known to the writer this species has igmental. Layers with edgewise MB collected. It occurs invariably with Crepicephalus texanus. The /ision is easily recognizable, sincflk SKeof the Abrigo has been located in the Escabrosa Ridge at Bisbee; in • weathering than the beds of the of ^Whetstone Mountains, Cochise County, between Benson and Tucson; the formation are beds of oolitic? Picacho de Calera Hills, Pima County, 25 miles west of Tucson; et thick, replete with small sphc .ill the Santa Catalina Mountains, Pinal County, 30 miles north of ng to show algal structure under! sstone are thin-bedded pink andj len first found, the specimens of Hesperaspis were supposed to belong and thin-bedded gray arenaceous I j|iew genus. Realizing that similar material might be present in the icimens of Alokistocare cfr. linnar ^collections of Walcott, or even described in Walcott's unpublished rhese beds are of interest for theg ^Bcripts, the writer in 1928 sent photographs of the Arizona form Llokistocare, all undescribed s{ li&vid White, and asked him to submit them to Ulrich and Resser, U-preserved specimens of a Micro charge of Walcott's material. White's answer contained the (P.) superba (Walcott) princips Jg statement: jidium. The top of the formatioi * Ulrich has examined your photographs of the trilobite found with Crepi- he algae-like inclusions. Thisy u texanus. He says the form you have is allied to Giordanella from Sardinia, a H,. Ransome: Some Paleozoic sections in Arizona and their correlation, U. S. Geol. Surv., nsome: The geology and ore deposits of 98-K (1916) pi. 25. 'ap. 21 (1904) p. 28-30. ^Walcott: Cambrian Brachiopoda, U. S. Geol. Surv., Mon. 51 (1912) p. 417, 422. gj^Walcott: Cambrian geology and paleontology: Cambrian trilobites, Smithson. Misc. Coll.. fife (W16) p. 213. F; I 468 A. A. STOYANOW—CORRELATION OF ARIZONA PALE02 CAMBI but is more strictly congeneric and is probably specifically the aunS^ j|y^. Hesperaspis butl described in unpublished manuscripts of Mr. Walcott as Hesperas^^S^ cott. This species occurs toward the close of the Crepicephalus faunitlSP! H' (piate 11' Rocky Mountains of Montana and in Wyoming. - Kpecies differs from Hesperaspis r, Later the writer had an opportunity to examine the mat^4tM tgated cranidium, highest in the j glabella always visible in front, a Little Rocky Mountains, preserved in the Smithsonian Institute Tferentiation of the frontal border, i Arizona material is much better preserved, and its stratigraphy Hoeer to the glabella, a stronger- JTl spine. ! is precisely known. At present, two species are distinguish^ ife a smaller form and never attains Upper Cambrian of Arizona at the base of the Crepicephalt. jeraspis butleri is widely distributt zone. To avoid nomina nuda, these forms are here provisionally'! ^fa practically every known outci as Hesperaspis ransomei n. sp., and H. butleri n. sp., both Itone Canyon between Bisbee and ! fPicacho de Calera Hills; and in t! fossils for the basal Abrigo. (base of the Abrigo formation wit' Hesperaspis ransomei, new species iie Whetstone Mountains, app (Plate 1, figures 8, 7) brigo with Hesperaspis butler Cranidium from medium size to large, somewhat flat, with a bruou i'up of trilobite fragments, anc subrectangular above the postero-lateral limbs, highest above its mid-wq the anterior part of the glabella and in front of the eyes, thence it slop* one that have casts of large anteriorly and posteriorly. Glabella very faintly outlined but nearly alwajl* here in association with a n> in reflected light or when covered with ammonia powder. The shallow and * dorsal furrows are strongest in the posterior part of the glabella and almost [genus. Asaphiscus (Blainia) > in front; consequently, the glabella is distinctly separated from the fixe< is related to Asaphiscus, b in its posterior part only, where it is raised above the postero-lateral lix elevated along a gentle and obtuse median ridge which disappears ant icterize this horizon. whereas, anteriorly it merges into the frontal limb. Nevertheless, the rounded-in-front outline of the glabella is clearly indicated. There are no | oer Queen limestone.—The y furrows. The broad, convex, crescentic, occipital segment, separated from , Arizona consists of localizi bella by a very shallow, barely perceptible depression representing the furrow, bears a strong median elevation, passing posteriorly into a sharp .Bisbee-Tucson sub-area, the spine. go formation is represented by Postero-lateral limbs large, wide, semicrescentic in outline, sloping out*— posteriorly, abutting against the posterior part of the glabella, with deeply IBJJ one and the Rincon limesto posterior furrows not connected with the occipital furrow. Fixed cheeks, ' ansome20 has described in th( half as wide as the glabella, merge into a broad frontal limb which u by an almost imperceptible depression from the narrow frontal border. rwP® one 6 feet in thickness abo lobes of medium size, not elevated above the fixed cheeks, contained aoowjj^ limestone withstands weath times in the length of the glabella, are placed about the mid-length of the Palpebral ridges absent. , taiw go, which is made of "rathe Facial sutures, cutting the posterior border within the genal angles, ascend In Ransome's Figure 4, r around the postero-lateral limbs to the base of the palpebral lobes, ouuffl"^ latter, cutting a little inward above, and thence extend anteriorly and 1 won in the Escabrosa Ridge n giving an expanding aspect to the frontal limb. They curve rather abruptly ^ fy as the upper hill within i at the frontal border and are intramarginal for a short distance. hedd*' Free cheeks rather wide, slightly convex, with genal angles extended do® kMobites collected there by 1 in strong short spines. ?i?. Walcott and Irvingella1 Thorax unknown. , Pygidium from semi-elliptical to subtrigonal in outline, short and . •close examination of this lir convex sub cylindrical axial lobe is elevated, especially so in its Posten°L5or P06- It is here called the Co does not reach the posterior extremity. On the axial lobe, the three fotftfc annulations are very distinct, the first one more raised than the rest, i .
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