Mississippian Rugose Corals, Peratrovich Formation, West Coast, Prince of Wales Island, Southeastern Alaska by AUGUSTUS K

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Mississippian Rugose Corals, Peratrovich Formation, West Coast, Prince of Wales Island, Southeastern Alaska by AUGUSTUS K Mississippian Rugose Corals, Peratrovich Formation, West Coast, Prince of Wales Island, Southeastern Alaska By AUGUSTUS K. ARMSTRONG GEOLOGICAL SURVEY PROFESSIONAL PAPER 534 Systematic descriptions of the rugose corals and paleoecologic studies of the marine carbonate sediments UNITED STATES GOVERNMENT PRINTING OFFICE, WASHINGTON : 1970 UNITED STATES DEPARTMENT OF THE INTERIOR WALTER J. HICKEL, Secretary GEOLOGICAL SURVEY William T. Pecora, Director Library of Congress catalog card No. 72-606744 For sale by the Superintendent of Documents, U.S. Government Printing Office Washington, D.C. 20402 - Price $1 [paper cover) CONTENTS Page Systematic paleontology-Continued Abstract................................ 1 Genus Lithostrotion Fleming-Continued Previous work and introduction- - - -___ ____ ---___ _._ -_ 1 Subgenus Siphonodendron BfcCoy-Continued Page Acknowledgments-- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Lithostrotion (Siphonodendron) species- - - _ - Peratrovich Formation- - - _ - - - _-- - - - - - - - - - - - - - - - - - - -. Genus Diphyphyllum Lonsdale ------------------ -- Stratigraphy, paleoecology, and distribution of Diphyphyllum venosum new species-- - - - - _ _ _ - - - rugose corals-----------_-------.-----..------ Diphyphyllum klawockensis new species- - - -- - - - Coral zones and age --_--__-_-------__---------- Genus Lithostrotionella Yabe and Hayasaka- - _ _ _ - - - Systematic paleontology- - - - - - _ _ - - - - - - - - - - _ _ _ - - -.- - - - Lithostrotionella banffensis (Warren) _ - _ - - _ _ _ - - _ Genus Ekvasophyllum Parks-----___-___._-____- Lithostrotionella pennsylvanica (Shimer) - - - - - - - - Ekvasophyllum cf. E. inclinatum Parks___ __ _ _-- Lithostrotionslla birdi new species- -- - - - - - -_- - _ Genus Faberophyllum Parks ---___________-------- Lithostrotionella peratrovichensis new species.. - - - _ - - - - - - Faberophyllum williamsi new species-_ - - Genus Thysanophyllum Nicholson and Thomson- - - - _-_-__-------- Faberophyllum girtyi new species Thysanophyllum astraeiforme (Warren) -- - - - - - - - Genus Lithostrotion Fleming-_ _ _ _ _ _ _ _ _ _ _ - -- - - - - - - - Genus Sciophyllum Harker and McLaren- - - ---_--- Subgenus Siphonodendron McCoy_--_ _--- -- --- Sciophyllum alaskaensis new species- - --------- Lithostrotion (Siphonodendron) warreni Ne\son--------------------.--------- Lithostrotion (Siphonodendron) succinctus new species- - - --- - -- - - - - .. - - -- - - - - - - - - ILLUSTRATIONS [Plates follow index] PLATE 1. Ekvasophyllum cf. E. inclinatum Parks, Faberophyllum girtyi n. sp. 2. Faberophyllum williamsi n. sp. 3. Faberophyllum girtyi n. sp. 4. Lithos?rotion (Siphonodendron) warreni Nelson 5. Lithostrotion (Siphonodendron) sp. Diphyphyllum kiawockensis n. sp. 6. Diph yphyllum venosum n. sp. 7. Lithostrotionella birdi n. sp.; Lithosfrotion (Siphonodendron) succinctus n. sp. 8. Lithostrotionella birdi n. sp.; Lithostrotionella aff. L. mclareni Sutherland 9. Lithostrotionella pennsylvanica (Shimer) ; Diphy phyllum venosum n. sp. 10. Lithostrotionella banffensis (Warren) 11. Sciophyllum alaskaensis n. sp.; Thysanophyllum astraeiforme (Warren) 12. Sciophyllum alaskaensis n. sp.; Ekvasophyllum cf. E. inclinatum Parks; LithostrotionelZa peratrovichensis n. sp. 13. Lithostrotionella banffensis (Warren) Page FIGURE 1. Index map showing the location of Peratrovich, Madre de Dios, Ladrones, and Shelikof Islands on the northwest side of Prince of Wales Island_-______------------.----------------------------------------------- 2. Chart showing lithologic and paleontologic symbols ubed in this report- - - - - - - - - - - - - - - -. - - - - - - - - - - - - - - - - - - - - 3. Generalized stratigraphic column for the Peratrovich Formation in the Peratrovich-Ladrones Islands region-- - 4. Photograph of the chert member at Cape Suspiro, 1.2 miles south of Craig, Alaska .......................... 5. Photograph of the chert on the bedding surface in the lower part of the limestone and chert member, Toti Island-___--__-_------------------------------------------------------------------------------- 6. Photograph of typical exposures of the lower part of the limestone and chert member on the southeast side of TotiIsland---______-___----------------------------------------------------------------------- 7. Index map of fossil localities and stratigraphic sections and fossil localities, 66X-6, Toti Island and 66X-11 Madre de Dios Island-----_--__---_________---_..-----------__----------------------------------------- 8. Index map of fossil localities and of stratigraphic section 66X-7 on Shelikof Island and stratigraphic section 66X-10 on unnamed island 1 mile west of Shelikof Island--- - - - - _ _ - _ - _ - _ - - - - - - - - - - - - -- .. - - - - - - - - - - - - - - 9. Stratigraphic section 66X-6, Toti Island--- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - IV CONTENTS Page FIG~RE10. Stratigraphic section 66X-11, Madre de Dios Island ----___-_------____-_----__-----__-----__-_-----_--_9 11. Stratigraphic section 66X-7, Shelikof Island- - - - - - - - - _ _ _ _ _ - _ - - - --__ _ - _ - - - _ _ _ - _ - - - _ _ _ - _ - _ _ - - _ - _ - - _ _ - _ - _ _ 10 12. Stratigraphic section 66X-10, on small unamed island 1 mile west of Shelikof Island ___-_______-_-----------10 13. Graph showing variations in alar diameter and number of major septa in Ekvasophyllum cf. E. inclinatum Parks- 12 14. Graph showing variations in alar diameter and number of major septa in Faberophyllum williamsi n. sp-- _ _ _ _ _ - 15 15. Graph showing variations in corallite diameter and number of major septa in Lithostrotion (Siphonodendron) warrmi Nelson--------------------------..----------------------------------------..------------- 16. Drawings of thin sections of Lithostrotion (Siphonodendron) warreni (Nelson) - - - - - - - _ _ _ _ _ - -- _ _ _ _ _ - - - _ _ _ - - _ _ _ 17. Drawings of thin sections of Lithostrotion (Siphonodendron) succinctus n. sp ----- -- - - _ _ _ - - - _ - -- - - -- - - - - - - - - - - 18. Graph showing variations in corallite diameter and number of major septa in Lithostrotion (Siphonodendron) succinctusn. sp-________------------------------------------------------------------------------ 19. Drawings of thin sections of Lithostrdion (Siphonodendron) sp- - _ _ _ - - - - _ _ _ _ - _ _ _ - - - - - - - - -- - - - - - - - - - - - - - - - - - 20. Graph showing variations in corallite diameter and number of major septa in Lithostrotion (Siphonodendron) sp- 21. Drawings of thin sections of Diphyphyllum venosum n. sp- - _ - _ _ _ _ _ - - - - - - - _ _ - _ - - - - - - - - - - _ - - - - - _ _ _ _ _ _ _ _ - _ _ _ 22. Graph showing variations in corallite diameter and number of major septa in Diphyphyllum venosum n. sp. and Diphyphyllum klawockensis n. sp -_-__--------..................... ------- - ---- ------- ----- ------ -- 23. Drawings of thin sections of Diphyphyllum klawockensis n. sp-___-_---_________------_-___--_-_______--__- 24. Graph showing variations in corallite diameter and number of major septa in Lithostrotionella banffensis (Warren) _ 25. Graph showing variations in corallite diameter and number of major septa in Lithostrotionella pennsylvanica (Shimer)---__---------------------------------------------------------------------------------- 26. Drawings of thin sections of Lithostrotionella birdi n. sp.................................................. 27. Graph showing variations in ccrallite diameter and number of major septa in Lithostrotionella birdi n. sp. and Lithostrotionella aff. L. mclareni Sutherland ----- - - - - - - - - - -- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 28. Drawings of thin sections of Lithostrotionella peratrovichensis n. sp.._--_-_-___ _------------ --- --------- ---- 29. Graph showing variations in corallite diameter and number of major septa in holotype of Lithostrotionella peratrovichensis n. sp_-_-_------------------_----------------------------------------------------- 30. Drawings of thin sections of Sciophyllum alaskaensis n. sp ............................................... TABLE Page TABLE 1. Classification of carbonate rocks according to depositional texture- - - - - - - - _ _ _-- - - - - - - - - -- - -- --- --- - -- - - -- - 3 MISSISSIPPIAN RUGOSE CORALS, PERATROVICH FORMATION, WEST COAST PRINCE OF WALES ISLAND, SOUTHEASTERN ALASKA ABSTRACT More recent geologic mapping of the northwest side The Mississippian Peratrovich Formation, northwestern of the Prince of Wales Island by the U.S. Geological coastal regions of the Prince of Wales Island, Alaska, contains Survey has resulted in more detailed stratigraphic three members that represent continuous marine sedimenta- studies and paleontologic collections. These investiga- tion from Osage into Chester time. The chert member, about 200 tions were conducted by G. D. Eberlein and Michael fe<&thick, rests disconforably on strata of Devonian age and is composed of dark-gray radiolarian cherts. lime mudstones, and Churkin, Jr. during the field seasons of 1964-66. I thin shale beds that were deposited in an euxinic environment. joined them in the Craig region for 4 weeks in the sum- The limestone and chert member, about 400 feet thick, is com- mer of 1966 and examined most of the known Mississip- posed of gray chert and of bryozoan, echinoderm, foraminifera1 pian outcrops, measuring stratigraphic sections, wackestones and packstones. Ekvasophyllum cf. E. inclinatum collecting megafossils,
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