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Ostracodes from the Upper Part of the Sundance Formation of South Dakota, Wyomin and Southern Montana

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Ostracodes from the Upper Part of the Sundance Formation of South Dakota, Wyomin and Southern Montana Ostracodes from the Upper part of the Sundance Formation of South Dakota, Wyomin and Southern Montana GEOLOGICAL SURVEY PROFESSIONAL PAPER 243-A Ostracodes from the Upper part of the Sundance Formation of South Dakota,Wyoming and Southern Montana By FREDERICK M. SWAIN and JAMES A. PETERSON SHORTER CONTRIBUTIONS TO GENERAL GEOLOGY, 1952, PAGES 1-18 GEOLOGICAL SURVEY PROFESSIONAL PAPER 243-A Description and illustrations of a Late Jurassic fauna from the Redwater shale member', distribution of ostra- codes in the Swift formation UNITED STATES GOVERNMENT PRINTING OFFICE, WASHINGTON : 1952 UNITED STATES DEPARTMENT OF THE INTERIOR Oscar L. Chapman, Secretary GEOLOGICAL SURVEY W. E. Wrather, Director For sale by the Superintendent of Documents, U. S. Government Printing Office Washington 25, D. C. - Price 35 cents CONTENTS Page Page Abstract..._ __________________________________ 1 Description of species—Continued Introduction ___________________________________ 1 Cypridae ___________________ 9 Stratigraphic sections._____-_---_-____________- 2 Cytheridae__ _ -_____-_______- 10 Ancestral relationships of the Redwater ostracodes. 7 References- _____________________ 14 Description of species__________________________ Index._.____-___________-__-__. 17 Cy therelh'dae_ ___________________________ ILLUSTRATIONS Pag* Plate 1. Cytherellidae, Cypridae, and Cytheridae._________-_______________---___-_-------_-----_---following index 2. Cytheridae._____________•_____________________________________________________________.following index Figure 1. Index map showing localities from which the ostracodes described or listed in this paper were obtained.__________ 2 in OSTRACODES FROM THE UPPER PART OF THE SUNDANCE FORMATION OF SOUTH DAKOTA, WYOMING, AND SOUTHERN MONTANA By FREDERICK M. SWAIN and JAMES A. PETERSON ABSTRACT stratigraphic distribution of the ostracodes of the Red- The Redwater shale member of the Sundance formation or water in wells in the Powder River Basin, eastern the upper part of the Sundance of Late Jurassic age in South Wyoming, is being conducted by J. A. Peterson. Dakota, Wyoming and Montana has yielded 16 species of Ostra- It is hoped later to describe the ostracodes collected coda representing: Paraparchites Ulrich and Bassler, Eridoconcha by Imlay and Loeblich from the lower part of the Sun- Ulrich and Bassler, Cytherella Jones, Macrocypris Brady, Aparchi- dance formation of South Dakota, Wyoming and south­ tocythere Swain and Peterson, n. gen., Monoceratina Roth, Camptocythere Triebel, Leptocythere Sars, Cytherura Sars, Pro- ern Montana and from the equivalent Rierdon forma­ gonocy'there Sylvester-Bradley, Protocythere Triebel, Cythereis tion of central Montana. In addition, papers on the Jones. These species are described and illustrated. Foraminifera are being prepared by A. R. Loeblich, Aparchitocythere n. gen., may have descended from Ellipsella Jr., and Helen Tappan (Mrs. A. R. Loeblich) (1950a, Coryell and Rogatz of the Carboniferous and Permian or from 1950b). a related genus, which in turn may have descended from Graph- iodactylus Roth of the Devonian and Mississippian. The Redwater shale member has yielded 16 species of The Jurassic species of Monoceratina Roth, Leptocythere Sars, Ostracoda, 14 of them new, representing 12 genera, one Cytherura Sars, and Camptocythere Triebel resemble Aparchi­ of which is new. Two genera are recorded for the first tocythere in several features of the shell but Monoceratina at least time in North America. The following species were seems to have originated in the Devonian from some genus other obtained at the type locality of the Redwater shale than Graphiodactylus. The Jurassic genus Progonocythere Syl­ vester-Bradley may lie in the evolutionary stock that contains member (Swain and Peterson, 1951): Paraparchites? Savagella lindahli (Ulrich) of the Mississippian. Protocythere sp., Eridoconcha monopleura Swain and Peterson, Triebel of the Jurassic and Cretaceous may have descended from Aparchitocythere loeblichorum (Swain and Peterson), some species of Basslerella Kellett of the Carboniferous and Progonocythere hieroglyphica Swain and Peterson, P. Permian. crowcreekensis Swain and Peterson, Cytherura lanceolata A new species here referred to Cythereis Jones may bear an ancestral relationship to Amphissites Girty or to a middle and Swain and Peterson, Monoceratina sundancensis Swain late Paleozoic kirkbyid. and Peterson, Leptocythere imiayi Swain and Peterson, and Cytheridea? sp. INTRODUCTION The doubtful Paraparchites and the Eridoconcha, as representatives of the Leperditellidae (a family which This paper is the second dealing with marine Jurassic almost completely died out at the end of the Paleozoic ostracodes from the western interior United States. era), form the most primitive elements of the Red- The first article described species that occur in the water fauna. They have not been found in the collec­ Eedwater shale member of the Sundance formation at tions from other localities in the Redwater member or the type locality (no. 1 on fig. 1) on Redwater Creek, in the underlying portions of the Sundance. The south half, Sec. 2, T. 7 N., E. 1 E., Butte County, Cytherellidae are represented in the Redwater by two South Dakota (Swain and Peterson, 1951). species and the Cypridae by one species. The other The present article deals with ostracodes obtained by ostracodes from the type locality are Cytheridae, Imlay and Loeblich from the Kedwater shale member mostly of primitive character with the terminal hinge- of the Sundance formation at other localities in South teeth and sockets weak or crenulate. Dakota, Wyoming and southern Montana, and also The following species were not found in the type lists ostracodes from the stratigraphically equivalent locality of the Redwater shale member and are de­ Swift formation of central Montana. Imlay (1947, p. scribed here: Cytherella paramuensteri, C. ventropleura, 231, 1949, p. 79) correlated the Redwater shale member, Macrocypris minutus, Aparchitocythere typica, Cythereis? which is the upper part of the Sundance, with the Ox- zygoventralis, Protocythere quadricarinata, and Camp­ fordian stage of Europe. A more complete study of the tocythere elliptica. SHORTER CONTRIBUTIONS TO GENERAL GEOLOGY, 1952 —— -"" —— __ __ — —— _ C __A —— _________N ADA - - __ __ __ —— ,--^ —— \ 9 X \ \ ~ A K 0 T A | NORTH DA^ \ 7x 8 \ M ° X NTANA!M M H | ° BISMARCK Iy N \ _ ___ _________________ - ——— ———} Billings \. v•«* 6 * ' ———————————————— -— TT 1 v 1 2 o S| 10 Sheridan 1 Xo vl Spearfish . k" O T A i Cody Sundance 1 o °X4 S 0 U T H o D A PIERRE * 1 W Y o M| o N G Rapid City Newcastl e !L LIST OF LOCALITIES 1. Redwoter shale, SI/2 sec. 2,T. 7N..R.I E.,Butte x t County , S. Dak. 5 ^ Sheridan County, Wyo. Casper 1 ~"~ "" — — — ^^ ^» 3. Redwoter shale, sec. I8,T. 45N..R.60W. o v\ Weston County, Wyo. T 4. Redwater shale, sec. 3,T. 6 N., R. 2 E ., t Lawrence County, S. Dok. \ 5. Redwoter shole , N 1/2 sec. 14 , T. 7 S., R.3 E 1 Foil River County, S. Dak. ' ' 1 6. Swift formation, sec. 19, T. 7 S., R. 24 E ., Carbon County, Mont. 7. Swift formation, sec. 2, T. 14 N. , R. 19 E and sec. 35., T. 15 N., R. 19 E., Fergus County, Mant. * S K A 8. Swift formation, sec.- 17, T. 14 N., R.20E., N E B R A Fergus County, Mont. i 9. Swift formotion, sec. 32, T. 25 N R 24 E Phillips County, Mont. CHEYENNE 10. Swift formation , sec. 36, T. 53 N., R. 102 W. 0 ,., — — _ t t MffDLN Park County, Wya. ' "-1 —•-1———1 "™ •• "———^—— —••——•——"——" • Ul'^V^' o 25 0 200 Miles FIGURE 1.—Index map showing localities from which the ostracodes described or listed were obtained. In the present material, ostracodes were most abun­ Kootenai formation (basal part): Feet dant in Red Gulch, Sheridan County, Wyoming. Sandstone, fine-grained, grayish-white_____________ 4 Descriptions of this and the other measured sections of Concealed. ____________________________________ 15 Sandstone, massive, cliff-fonning, light-gray, strongly the Redwater shale member from which ostracodes cross-bedded, irregular lower surface.___________ 20 were obtained follow. Index numbers assigned to beds Morrison formation: that were sampled (J-61p, etc.) indicate the occurrence 64. Shale, soft, light-red, upper 3 feet mostly green­ of each species in the Descriptions of Species. ish-gray———— —————— ————————.___ 15 63. Sandstone, hard, light-gray, weathers yellowish. IK STRATIGRAPHIC SECTIONS 62. Shale and some sandstone, yellowish-gray______ 4 61. Shale, soft, yello wish-gray. _ ___________ _______ 6 The following sections were measured and described 60. Sandstone, hard, grayish-white, weathers dark by R. W. Imlay in 1945, and samples were collected for gray, forms ledge__________________ 3 microfossils by R. W. Imlay and A. R. Loeblich in 1948: 59. Shale, soft, light greenish-gray._______________ 25 58. Sandstone, hard, grayish-white, weathers dark Jurassic formations along east side of Red Gulch about 2% gray, forms ledge________________________ 4 miles south of Little Horn River in Sec. 22, T. 58 N., R. 89 W., 57. Shale, partly silty, light-red and greenish-gray. _ _ 24 Sheridan County, Wyoming. (Measured by R. W. Imlay and 56. Limestone, shaly, hard___________________ 1 Wm. Saalfrank 1945.) Collected September 23, 1948 by R. W. 55. Shale, light-red, becoming yellowish at top___._ 7 Imlay and A. R. Loeblich, Jr. (Locality 2 on fig. 1.) 54. Sandstone, fairly hard, light-gray___________ OSTRACODES FROM THE UPPER PART OF THE STJNDANCE FORMATION Morrison formation—Continued Feet Sundance formation—Continued Feet 53.
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