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Ostracoda from Wells in North Carolina: Part 2

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Ostracoda from Wells in North Carolina: Part 2 Ostracoda From Wells in North Carolina: Part 2. Mesozoic Ostracoda GEOLOGICAL SURVEY PROFESSIONAL PAPER 234-B Ostracoda From Wells in North Carolina: Part 2. Mesozoic Ostracoda By FREDERICK M. SWAIN GEOLOGICAL SURVEY PROFESSIONAL PAPER 234-B Descriptions, illustrations, geographic distributions, and stratigraphic ranges of microfossils 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 40 cents (paper cover) CONTENTS Page Page Abstract.--___-___-__„___-_-_______________________ 59 Systematic descriptions—Continued Introduction.. _ _____________________________________ 59 Cytheridae_ _________________ 72 Stratigraphic Summary__________________________ 59 Apatocythere_____ _ ________ 72 Mesozoic and older rocks in Esso Standard Oil Co. Schuleridea- ______________ 74 Hatteras Light well No. 1___________________ 62 75 Mesozoic rocks in Esso Standard Oil Co. North Asciocythere ______________ Carolina Esso well No. 2______________________ 67 Haplocytheridea_ __________ 78 Stratigraphic distribution of the Ostracoda________ 68 Brachycythere___________ 80 Systematic descriptions._____________________________ 68 Cythereis_ ________________ 81 Cytherellidae__ _ ______________________________ 68 Protocy there __ ____________ 85 Cytherella. ------_________-________________ 68 Pterygocythereis____ _ ______ 85 Cy therelloidea_ ___________________________ 68 Cy theropteron _____________ 86 Cypridae ______________________________________ 70 Krithe________________ 87 Cypris___ ________________________________ 70 Gomphocythere____ __ _ _ _. 87 Paracypris_ _ _______________________________ 70 Monoceratina_ ____________ 88 Ilyocypris ___ _____________________________ 70 Bairdiidae- ____________________________________ 71 Hutsonia. ________________ 88 Bairdia__________________________________ 71 Macrodentina_ ____________ 89 Bairdoppilata____________________________ 71 References. _ ______________________ 89 Bairdiocypris__ _ __________________________ 72 Index.___________________________ 91 ILLUSTRATIONS Page PLATE 8. Cytherellidae, Cypridae, Bairdiidae, and Cytheridae_________._____-____-_-_-___-_-_--__-__--_---- Following index 9. Cytheridae________________________________________________________________ _ _______________ Following index FIGURE 4. Index map showing locations of wells._______________________________-__-_--___----___----------_--_---- 60 5. Stratigraphic setions of the Upper Cretaceous rocks in Hatteras Light well No. 1 and North Carolina Esso well No. 2________-______-_-____.________.____________.______•___._____-__--_--_--____-----_-_--------_- 61 6. Stratigraphic sections of the Lower Cretaceous in Hatteras Light well No. 1 and North Carolina Esso well No. 2__ 61 7. Stratigraphic section of Upper Jurassic(?) and pre-Cambrian rocks in Hatteras Light well No. 1_ ——— __________ 62 in Ostracoda From Wells in North Carolina Part 2, Mesozoic Ostracoda By F. M. SWAIN ABSTRACT 1947). A survey of the regional subsurface strati­ This paper describes and illustrates 47 species of Mesozoic graphy and structure in eastern North Carolina, to­ Ostracoda from two deep wells in eastern North Carolina. gether with informative discussion of the Hatteras Twenty-two of the species are new. The following genera, one Light well and North Carolina Esso well No. 2, has of which is new, are represented in the collection: Cytherella Jones, Cytherelloidea Alexander, Cypris Miiller, Paracypris been provided by Spangler (1950). The Cenozoic Sars, Ilyocyprist Brady and Norman, Bairdiaf McCoy, Bairdop- Ostracoda from the Esso Standard Oil Co. wells and pilata Coryell, Sample and Jennings, Bairdiocypris? Kegel from several water wells in the eastern part of the Apatocytheref Triebel, Schuleridea Swartz and Swain, Asoiocy- State have been described in a previous paper (Swain, there Swain, n. gen., Haplocytheridea Stephenson, Brachycy- 1951). Study of the extensive foraminiferal fauna ob­ there Alexander, Cythereis Jones, ProtocytJiere Triebel, Ptery- ffocythereis Blake, CytJieropteron (Eocytheropteron) Alexander, tained from the wells is still underway. Krithe Brady, Crosskey and Robertson, GompJiocytJiere Sars, Sincere appreciation is expressed to officials of the Monoceratina Roth, Hutsonia Swain, and Macrodentina Martin. Esso Standard Oil Co. for providing the samples of Equivalents or partial equivalents of the following strati- their two deep wells; and to John B. Reeside, Jr., James graphic units arranged in descending order are represented in A. Peterson, William D. Quinlivan, Lawrence E. the subsurface of eastern North Carolina: Monley, and Louis M. Perry of the Geological Survey Upper Cretaceous Peedee (?) formation for their valuable assistance in this study. The study Black Creek (?) formation was supported mainly by the Paleontology and Strati­ Beds of Eutaw(?) age graphy Branch of the United States Geological Survej7 Beds of Eagle Ford( ?) age but funds from the Graduate School of the University Tuscaloosa (?) formation Upper and Lower Cretaceous of Minnesota also provided aid in laboratory and bibli­ Beds of Washita(?) age ographic work. Lower Cretaceous Beds of Fredericksburg(?) age STRATIGRAPHIC SUMMARY Beds of Trinity (?) and pre-Trinity(?) age undifferen- tiated The lithologic units in the two Esso Standard Oil Upper Jurassic (?) Company wells are briefly described below, and the Beds of Schuler(?) age correlations between the wells are presented in figures Pre-Cambrian 5 and 6. Descriptions of the lithologic sequence in each of the two The strata from 8,500 to 9,878 feet depth in the wells are given. The stratigraphic subdivisions differ in several respects from those suggested in a previous paper (Swain, 1947). Hatteras Light well No. 1 may represent the Upper Jurassic, and perhaps are equivalent to the Schuler INTRODUCTION formation of the central Gulf region because (1) the The Ostracoda described herein were obtained from unit contains three species of Ostracoda that occur two deep wells in eastern North Carolina: (1) Esso in the Schuler, (2) an ostracode species found in the Standard Oil Co., Hatteras Light well No. 1, long. Wealden (Neocomian) of Germany occurs just above T5°31'4" W., lat. 35°15'0.5" N., Cape Hatteras, Dare 8,500 feet, (3) the upper layers of the unit are cavern­ County, N. C.; (2) Esso Standard Oil Co., North Caro­ ous dolomitic limestone that appears to have undergone lina Esso well No. 2, long. 75°33'54" W., lat. 35°42'12" solution and weathering, suggesting an unconformable N., Pamlico Sound, Dare County, N. C. The locations contact with overlying strata, (4) there is general of the wells are shown in figure 4. lithologic similarity of the unit to the Schuler forma­ A brief description of the stratigraphic units en­ tion of southernmost Arkansas (Swain, 1944, pp. 594- countered in the two wells has been published (Swain, 600). Figure 7 shows the Upper Jurassic (?) and 59 60 OSTRACODA FROM WELLS IN NORTH CAROLINA 78° NORTHAMPTON ,' H E R T F 0 R D SAMPSONlQU 1 Esso Standard Oil Co. Hotteros Light I 2 Esso Standard Oil Co North Carolina Esso 2 10 0 50 Miles !,,,,! I I I I I FIGURE 4.—Index map showing locations of wells. pre-Cambrian rocks penetrated in Hatteras Light well tain Gytheropteron (Eocytheropteron) tumidwm, Alex­ No.l. ander and are believed to be Fredericksburg in age. The Tuscaloosa( ?) formation in the Hatteras Light The strata of Washita(?) and Fredericksburg(?) well No. 1 rests upon a thin marine bed believed to be age apparently are absent from the North Carolina of Washita age because of the occurrence of the Lower Esso well No. 2 and the Tuscaloosa(?) formation rests Cretaceous ostracode Cytheropteron (Eocytherop- unconformably upon strata that contain ostracodes of teron). The underlying 435 feet of marine strata con­ Trinity type. MESOZOIC OSTRACODA 61 Esso Standard Oil Co. Esso Standard Oil Co., North Carolina, Hatteras Light ESSQ Well No. 2 Well No. 1 Esso Standard Oil Co., Esso Standard Oil Co., North Carolina, Hatteras Light Esso Well No. 2 Well No. 1 Tuscaloosa (?) formation X4923' Beds of Washita (?) age, 5530 EXPLANATION Sandstone Conglomerate Limestone Sandy and Gray shale Green and Sandy shale shaly limestone red shale FIGURE 5.—Stratigraphic sections of the Upper Cretaceous rocks in FIGURE 6.—Stratigraphlc sections of the Lower Cretaceous rocks in Hatteras Light well No. 1 and North Carolina Esso well No. 2. Hatteras Light well No. 1 and North Carolina Beso well No. 2. 62 OSTRACODA FROM WELLS IN NORTH CAROLINA Esso Standard Oil Co., Upper Cretaceous—Continued Depth Thickness Hatteras Light Black Creek (?) formation (feet) (feet) Well No. 1 Shale and marl, medium- and light-gray; Beds of Early with units containing white chalk layers Cretaceous (?) age from 3,147-3,197 feet, 3,205-3,235 feet, EXPLANATION 3,270-3,290 feet and between 3,480-3,660 feet; sandy unit 3,520-3,540 feet; abun­ dant glauconite and nodular siderite 3,205-3,235 feet. Core 3,160-3,170 feet, recovered 10 feet, white, chalky, finely sandy, slightly glauconitic, slightly fos- siliferous limestone and marl, sp gr ranges from 1.89 to 2.02. Core 3,269- 3,279 feet, recovered 10 feet, medium- gray, laminated calcareous shale con­ Conglomeratic limestone taining abundant Foraminifera and oyster fragments. Core 3,380-3,390 feet, recovered 30 inches, medium-gray cal­ careous shale containing abundant
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