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Mississippian Ostracoda of the Amsden Formation (Mississippian and Pennsylvanian) of Wyoming

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Mississippian Ostracoda of the Amsden Formation (Mississippian and Pennsylvanian) of Wyoming Mississippian Ostracoda of the Amsden Formation (Mississippian and Pennsylvanian) of Wyoming GEOLOGICAL SURVEY PROFESSIONAL PAPER 848-G Mississippian Ostracoda of the Amsden Formation (Mississippian and Pennsylvanian) of Wyoming By I. G. SOHN THE AMSDEN FORMATION (MISSISSIPPIAN AND PENNSYLVANIAN) OF WYOMIN(;. GEOLOGICAL SURVEY PROFESSIONAL PAPER 848-G Descriptions and illustrations of 22 species of ostracodes UNITED STATES GOVERNMENT PRINTING OFFICE, WASHINGTON 1975 UNITED STATES DEPARTMENT OF THE INTERIOR ROGERS C. B. MORTON, Secretary GEOLOGICAL SURVEY V. E. McKelvey, Director Library of Congress Cataloging in Publication Data Sohn, Israel Gregory, 1911- Mississippian ostracoda of the Amsden Formation (Mississippian and Pennsylvanian) of Wyoming. (Geological Survey professional paper ; 848-G) Bibliography: p. Includes index. Supt. of Docs. no.: I 19.16 :848-G 1. Ostracoda, Fossil. 2. Paleontology-Mississippian. 3. Paleontology-Wyoming. I. Title. II. Series: United States. Geological Survey. Professional paper ; 848-G. QE817.08S573 565' .33'09787 74-31457 For sale by the Superintendent of Documents, U.S. Government Printing Office Washington, D.C. 20402 Stock Number 024-001-02639-2 CONTENTS Page Abstract ________ --.-----__ - _--------------------------------------------- G1 Introduction ------------------------------------------------------------­ 1 Acknowledgments -------------------------.------------------------------- 2.. Ostracode localities ___________________________________________ ---------- •) Systematic descriptions -------------------------------------------------- 3 References cited --------------------------------------------------------­ 18 Index __ ----·------------------------------------------------------------- 21 ILLUSTRATIONS [Plates follow index] PLATE 1. Balantoides, Healdia, Pse~tdobythocyp1·is?, Tetratylus, "Ectodemites," Bair­ dia, Cavellina, and H ollinella. 2. Nuferella, Sansabella, and Sargentina. 3. Shishaella, Glyptopleura, Glyptopleurites, Acratia?, and Amphissites. TABLE Page TABLE 1. Recorded distribution of Morey's sp.ecies G2 III THE AMSDEN FORMATION (MISSISSIPPIAN AND PENNSYLVANIAN) OF WYOMING MISSISSIPPIAN OSTRACODA OF THE AMSDEN FORMATION (MISSISSIPPIAN AND PENNSYLVANIAN) OF WYOMING By I. G. SoHN ABSTRACT all the species and the genus Balantoides Morey, The types of the ostracode assemblage described by Morey 1935 were described as new. Morey's ostracodes from the Horseshoe Shale Member of the Amsden Formation were extracted from float material at two localities : of Wyoming are reillustrated and reassigned to 14 genera. A lectotype for H ealdia ornata Morey, 1935 is designated and Cherry Creek (colin. 37 herein) and Amsden Hill illustrated. Two of the species originally described as Bairdia (collns. 24, 2.5 herein). The lithology of the Cherry by Morey are reillustrated, but considered as indeterminate; Creek locality was not given by Morey (1935, p. a third species in this genus is not illustrated because there 474), but at Amsden Hill, two types of lithologies is doubt that the specimens in the type-slide are those were collected : highly ferruginous red shade (colin. studied by Morey. The speciments identified by Morey as Paraparchites nicklesi (Ulrich, 1891) are presumed lost; 25) underlain by more highly ferruginous purplish based on the original description and illustration that taxon limestone (colin. 24), with the purplish limestone is questionably referred to Shishaella moreyi described here containing the same ostracode species as the Cherry as new. One ostracode is illustrated but not formally named, Creek material. The following ostracodes were two are provisionally referred to known species, and Cavellina spp. are illustrated. Specimens of Nu,ferella, Glyptopleur·ites, described: and Sansabella are illustrated in open nomenclature. Paraparchites nicklesi (Ulrich, 1891)=?Shishaella moreyi Glyptopleurites cf. G. windfieldi Scott, 1942 and Sansabella Sohn, n. sp. cf. S. bella Scott, 1942 are related to species in the Otter Sansabella amsdenensis Morey, 1935=Sargentina? ams- Formation of Montana. The type-species or other species in denensis (Morey, 1935) Acratia, Balantoides, Glyptopleurites, Nuferella, Sansabella, Sansabella? dubia Morey, 1935 and Sargentina are illustrated in order to document the Sansabella reversa Morey, 1935 generic reassignments. All the specimens from outside of Jonesina? puncta Morey, 1935=Nuferella? puncta (Morey, Wyoming that have been referred to Morey's species were 1935) misidentified. Glyptopleura multicostata Morey, 1935 The ostracode assemblage in the Horseshoe Shale Mem­ Amphissites warei Morey, 1935="Ectodemites" warei ber of the Amsden Formation is endemic, and suggests a re­ (Morey). Sohn 1962 lationship to the Otter Formation (Late Mississippian) of Amphissites robertsi, Morey, 1935 Montana. Based on the presence of Balantoides, Glyptop­ Balantoides quadrilobatus Morey, 1935 leurites, and Tetratylus, the age of the ostracode-bearing HoUinella typica Morey, 1935 rocks in the Horseshoe Shale Member is older than Penn­ Bairdia contracta Morey, 1935=nomen dubium (Sohn, 1960, sylvanian. p. 36) Bairdia delicata Morey, 1935=nomen dubium ( Sohn, 1960, INTRODUCTION p. 37) Baii'dia nasuta Morey, 1935=nomen dubium ( Sohn, 1960, This report is based on a poorly preserved faunule p. 39) from USGS collection 18788-PC (colin. 117 herein), Bythocypris amsdenensis Morey, 1935=Pseudobythocypris? obtained by heating some sandstone chunks and amsdenensis (Morey, 1935) Healdia ornata Morey, 1935 then crushing them, and on a restudy of the type­ Acratia disjunctus Morey, 1935=A.? disjuncta Morey, 1935 specimens of the assemblage described by Morey Cytherella bransoni Morey, 1935=Cavellina bransoni ( 1935) from the Wind River Range. All the locali- (Morey, 1935) ties are in the Horseshoe Shale Member of the Ams­ Morey's types and a vial of sediment containing den Formation. Morey described and illustrated 17 poorly preserved ostracodes that bears the label species in 12 genera from the Amsden Formation. "Amsden--Amsden Hill, Little Popo Agie" were Except for Paraparchites nicklesi (Ulrich, 1891), borrowed from the Department of Geology, Univer- Gl G2 THE AMSDEN FORMATION (MISSISSIPPIAN AND PENNSYLVANIAN) OF WYOMING sity of Missouri, Columbia. Unfortunately, only the I occurrences outside of Wyoming were misidentified. type-slides are now available at the University of Fortunately, I was able to borrow many of C. L. Missouri, and the slide containing the illustrated · Cooper's types (Cooper, 1941) and the uncataloged specimen of Paraparchites nicklesi (Ulrich, 1891) types of Coryell and Johnson (1939) and Coryell is presumed to be lost at this time. During the past and Sohn (1938) for direct comparison. Some of 35 years, some of the specim.ens on the type-slides these specimens are reillustrated in order to sub­ have spalled, and the slide for Bwird1~a contracta stantiate some of my generic and specific reassign­ (Univ. Missouri 0.1029-5) contains three badly cor­ ments. The only faunistic relationship that I can roded steinkerns, none of which matches the illus­ determine is that with Scott's (1942) assemblage trated holotype. from the Big Snowy Group of Montana from which Table 1 shows the recorded distribution by Morey Glyptopleurites windfieldi Scott, 1942 and Sansa­ and the locality of each of Morey's specimens as bella bella Scott, 1942 were described. H ollinella ra­ shown on the type-slides. diata (Jones and Kirkby) of Cooper, 1947 from the Because the type-series of Bairdia contracta, is upper part of the Kinkaid Formation of Illinois is recorded in table 1 as consisting of only two speci­ similar to, but not conspecific with H. typica Morey, mens, and the slide now contains three poorly pre­ 1935. All the genera known in the Amsden Forma­ served specimens, the ·entire collection of types tion have been recorded elsewhere in rocks of should be cautious1ly evaluated, and unless the sped­ Mississippian and Pennsylvanian ages, but Balan­ mens can be matched perfectly with the illustrations, toides Morey, 1935, Glyptopleurites CoryeU and they should be considered as not belonging to the Johnson, 1939, and Tetratyl1ts Cooper, 1941 have not types. In order to do that, and to document my de­ yet been recorded in rocks of Pennsylvanian age. I cisions, all the types, except B. contracta, were pho­ conclude from this study that the ostracodes in the tographed for this study. Horseshoe Shale Member of the Amsden Formation Prior to 1935, Upper Mississippian ostracodes in of Wyoming represent an endemic assemblage of North America were described in only 13 papers Mississippian, probably of late Chesterian age, that (Sohn, 1960, p. 2) ; these represent less than half is distinct from the ostracodes of approximately the the number of papers and a fraction of the taxa same age in the midcontinent. known now. Many of the species described by Morey from the Amsden Formation of Wyoming have been ACKNOWLEDGMENTS identified from. Mississippian (late Chesterian) I am grateful to the following for assistance: rocks in the midcontinent by later workers. By com­ Prof. R. L. Ethington, University of Missouri, Co­ paring these identifieations with Morey's types, I lumbia, for Morey's types; Prof. H. V. Howe and have been able to determine that all of the recorded Mr. A. M. Phillips, Jr., Louisiana State University, TABLE !.-Recorded distribution of Morey's species [X, recorded locality on the type-slide] Cherry Creek Amsden Hill Purple limestone Red Shale Collection 37 Collection
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