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Shorter Contributions to General Geology 1946 UNITED STATES DEPARTMENT OF THE INTERIOR J. A. Krug, Secretary GEOLOGICAL SURVEY W..E. Wrather, Director Professional Paper 210 SHORTER CONTRIBUTIONS TO GENERAL GEOLOGY 1946 UNITED STATES GOVERNMENT PRINTING OFFICE WASHINGTON : 1947 . CONTENTS [The letters in parentheses preceding the titles are those used to designate the individual papers! Pige (A) Tertiary Foraminifera from St. Croix, Virgin Islands (published in September 1946)__________________________.,____ 1 (B) A Pennsylvanian flbrule from the Forkston coal in the Dutch Mountain outlier, northeastern Pennsylvania (published in September 1946)_______________________________________________________________________________________ 17 (C) Reptilian fauna of the North Horn formation of central Utah (published in January 1947)------------____----_-___- 29 (D) Bulimina and related foraminiferal genera (published in ———— 1947)____________________________________________ 55 (E) New Upper Cretaceous fossils from Mississippi and Texas (published in ———— 1947)__-_--__-_-_-__-______________ 161 ILLUSTRATIONS Page PLATES 1-2. Flora of the Forkston coal______________ 24-25 FIGURE 1. Generalized geologic map of St. Croix_______ 2 3. View of badland. area of the North Horn 2. Cross section of central part of St. Croix, formation looking toward North Horn showing location of test wells with reference Mountain from the south._____________ 40 to the geologic features._________________ 3 4. Two views of quarry showing bones in place-_______________________________ 40 3. Reconstruction of Lacoea seriata Read, n. sp., 5—10. Skeletal parts of Alamosaurus sanjuanensis to show gross morphology______________ 20 Gilmore____________________________ 52 4. Chevrons of Alamosaurus sanjuanensis Gil- 11. Crest portions of th6 frill of Arrhinoceratops? more __________________________________ 33 utahensis Gilmore _____________________ 52 5. Outlines of sternal plates of Alamosaurus 12. Median portion of skull of Arrhinoceratops? sanjuanensis-. __________________________ 34 utahensis _ _____________________________ 52 13. Epoccipital bones tentatively referred to 6. Left scapula and coracoid of Alamosaurus Arrhinoceratops? utahensis- _____________ 52 sanjuanensis—-- _______________________ 35 14. Parts of ceratopsian skull and a hadrosau- 7. Forelimbs of Alamosaurus and Apatosaurus rian femur ___________________________ 52 viewed from in front-___________________ 37 15. Terebralina, Turrilina, and Buliminella---- 140 8. Right humerus of Alamosaurus sanjuanensis 16. Buliminella__________'_________________ 141 viewed from in front-____________________ 37 17. Buliminella, Buliminoides, and Ungulatella-.. 142 18. Robertina and Pseudobulimina ____________ 143 9. Right radius and ulna of Alamosaurus san­ 19,20. Bulimina___________________________ 144^145 juanensis shown as found articulated-_____ 38 21. Bulimina and Buliminella^ _______________ 146 10. Right metacarpus of Alamosaurus sanjuan­ 22-28. Bulimina____________ ________________ 147-153 ensis- _________________________________ 38 29. Bulimina, Bulimina (Desinobulimina), Ne- 11. Coossified ischia of Alamosaurus sanjuanensis ' obulimina, Globobulimina- ______________ 154 viewed from above______________________ 40 30. Buliminella, Bulimina, Globobulimina^ _ _ _ _ _ 155 31. Fossils from the A vent and McRae wells 12. Incomplete skull of Arrhinoceratops? utahensis in Mississippi and a new Venericardia Gilmore viewed from the right side________ 44 from Uvalde County, Tex______________ 190 13. Geologic map of North Horn area, Emery 32-33. Fossils from the Avent well in Mississippi. 192, 194 bounty, Utah___---_-_----__-------___- 49 INSERT Page Distribution of species of Foraminifera in three wells on St. Croix. 2 m UNITED STATES DEPARTMENT OF THE INTERIOR J. A. Krug, Secretary GEOLOGICAL SUKVEY W. £. Wratber, Director Professional Paper 210-A TERTIARY FORAMINIFERA FROM ST. CROIX VIRGIN ISLANDS BY J. A. CUSHMAN WITH A NOTE ON THE GEOLOGY BY D. J. CEDERSTROM • Shorter contributions 'to general geology, 1946 (Pages 1-17) UNITED STATES GOVERNMENT PRINTING OFFICE WASHINGTON : 1946 For Ml* by the Superintendent of Documents, U. S. Government Printing Office, Washington 25, D. C> Price 20 cents CONTENTS Pkge Abstract _ ____________________________________________________________________________________________________ 1 Introduction _________________________________________________________________________________________________ I Note on the geology of St. Croix, Virgin Islands, by D. J. Cederstrom________________________________________________ 1 Foraminifera_ ________________________________ _*_____________l_________________--_-.___--___-__---__ _'_______-___ 2 Distribution and age.______________________________________________________________________________________ 2 Notes on the species-_--_____________-__._-____________________________--_-_____----____---__________-__--- 2 Index. ___________________________________'______.___._______.._ ________._.__--____--_---__-__-_-_____----__--_ 15 ILLUSTRATIONS Page FIGUBE 1. Generalized geologic map of St. Croix___________.___-__.________-__-_--._.-_-_--__-__-_-_--._--.._-_____ 2 2. Cross section of central part of St. Croix, showing location of test wells with reference to the geologic features.. _ 3 INSERT Page Distribution of species of Foraminifera in three wells on St. Croix_______-___.-____-_-___-_-____---________-._-_---- 2 n Tertiary Foraminifera from St. Croix, Virgin Islands By J. A. CUSHMAN ABSTRACT somewhat more consolidated thin-bedded white lime­ This paper records the Foraminifera found in three wells stone strata. These beds are gently folded along axep drilled on the island of St. Croix, V. I. The spe cies and varieties that trend west-southwest. The test drilling revealed found total 103 forms, of which 5 wexe originally described from this material. Two of the wells and the upper part of the third that these limy strata are underlain by a gray clay and appear to cut Miocene rocks. The lower part of the third well included limestone conglomerate whose maximum appears to have reached Oligocene rocks. thickness is unknown.1 In test well No. 1, the location of which is shown in figure 1, a thickness of 1,400 feet INTRODUCTION of this formation was penetrated. In test well No. 2 This paper is based on the Foraminifera found in the the gray clay is underlain by a basal limestone conglom­ cuttings from three test wells drilled in the winter of erate, as shown in the -accompanying log of the well 1938-39 on the island of St. Croix, V. I. These wells and in the diagram, figure 2. / were drilled as part of a program of test drilling for The older Upper Cretaceous rocks making up the ground water financed by the Public Works Adminis­ mountainous areas, referred to by Kemp 2 as the tration and were located on lands owned by the United Mount Eagle series, are referred to now as the Mount States Government that have been put to economic use Eagle volcanics. The marly Tertiary rocks exposed at by the Virgin Islands Co., a quasi-government corpora­ the surface of the rolling plain were named the Kingshill tion. The wells were drilled by the rotary, clay-seal series by Kemp.3 They are now referred to as the method, and much mixing of material from, lesser depths1 Kingshill marl. The dark clays and included conglom- ' with that of greater depths has taken place. It is eratic material found below the light colored Kingshill believed, however, that valuable data have been ob­ marl have been named by the writer 4 the Jealousj" tained from the cuttings and that the results ape well formation. worth recording. Much has been written on the,geology of St. Croir, by Danish, German, Swedish, and American geologists. The geographic and geologic setting of the wells is Most of the reports written before 1927 are reviewed described by D. J. Cederstrom, of the Geological by Kemp in the publication referred to above. The Survey, who made a study of the geology and ground- report by Vaughan 5 on the stratigraphy of St. Croix ir water conditions of the. island, supervised the test of especial interest to students of paleontology. Foram­ drilling, and collected the cuttings on which this paper inifera and other fossils are listed in his report that is based. were found in samples taken from outcrops at Evening NOTE ON THE GEOLOGY OF ST. CROIX, VIRGIN ISLANDS Hill and Montpeiier, 1 mile and 3 miles, respectively, northwest of Christiansted; at Annas Hope, 2 milee By D. J. CEDERSTROM southwest of Christiansted; and near Wheel of Fortune Estate, 1 mile south of Frederiksted. Vaughan founc1 The island of St. Croix lies about 95 miles south- that the strata at Evening Hill and Montpeiier are prob­ southeast of San Juan, P. R., and is one of the Virgin ably late Oligocene in age, although they may possibly Islands group, of which St. Thomas, St. John, and St. be assigned to early Miocene. At Annas Hope the Croix belong to the United States. The island is about horizon was determined to be very low in the Miocene, 21 miles long. The western part is about 6 miles wide, and near Wheel of Fortune the strata were assigned tc but the eastern part tapers to a width of less than 1 the middle Oligocene. mile at the eastern end. The main geologic features of the island of St. Croix The western part of the island is made up Of a are outlined.in two papers.6 mountainous area on the north and a rolling plain on 1 Cederstrom, D. J., Notes on the physiography of St. Croix, V. I.: Am. Jour. the south. The eastern part of the island is moun­ Sci.,
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