Mississippian Rugose Corals, . Peratrovich Formation, West Coast, Prince of Wales Island, Southeastern Alaska
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Mississippian Rugose Corals, . Peratrovich Formation, West Coast, Prince of Wales Island, Southeastern Alaska GEOLOGICAL SURVEY PROFESSIONAL PAPER 534 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 sturiies 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 Litlwstrotion Fleming-Continued Previous work and introduction _____________________ _ 1 Subgenus Siphonodendron MeCoy-Continued Page Acknowledgments __________________________________ _ 5 Lithostrotion (Siphonodendron) species ____ _ 22 Peratrovich Formation _____________________________ _ 5 Genus Diphyphyllum Lonsdale ___________________ _ 23 Stratigraphy, paleoecology, and distribution of Diphyphyllum venosum new species ___________ _ 24 rugose corals ________________________________ _ 5 Diphyphyllum klawockensis new species _______ _ 27 Coral zones and age ___________________________ _ 7 Genus Lithostrotionella Y abe and Hayasaka _______ _ 28 Systematic paleontology ____________________________ _ 11 Lithostrotionella banffensis (Warren) __________ _ 29 Genus Ekvasophyllum Parks _____________________ _ 11 Lithostrotionella pennsylvanica (Shimer) _______ _ 31 Ekvasophyllum cf. E. inclinatum Parks ________ _ 11 Lithostrotiondla birdi new species ____________ _ 32 Genus Faberophyllum Parks _____________________ _ 14 Lithostrotionella peratrovichensis new species ___ _ 35 F aberophyllum williamsi new species __________ _ 14 Genus Thysanophyllum Nicholson and Thomson ___ _ 37 Faberophyllum girtyi new species _____________ _ 16 Thysanophyllum astraeiforme (Warren) ________ _ 37 Genus Lithostrotion Fleming _____________________ _ 18 Genus Sciophyllum Harker and McLaren _________ _ 38- Subgenus Siphonodendron McCoy ____________ _ 18 Sciophyllum alaskaensis new species ____ ------- 38 Lithostrotion (Siphonodendron) warreni Fossil localities _________________________ ------------ 40 Nelson _____________________________ _ 18 Iteferences ________________________________________ _ Lithostrotion (Siphonodendron) succinctus 40 new species _________________________ _ 20 IndeX--------------------------------------------- 43 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. Lithostrotion (Siphonodendron) warreni Nelson 5. Lithostrotion (Siphonodendron) sp. Diphyphyllum klawockensis n. sp. 6. Diphyphyllum venosum n. sp. 7. Lithostrotionella birdi n. sp.; Lithostrotion (Siphonodendron) succinctus n. sp. 8. Lithostrol,ionella birdi n. sp.; Lithostrotionella aff. L. rnclareni Sutherland 9. Lithostrotionella pennsylvanica (Shimer) ; Diphyphyllum venosurn n. sp. 10. Lithostrotionella banffensis (Warren) 11. Sr,iophyllurn alaskaensis n. sp.; Thysanophyllurn astraeiforrne (Warren) 12. Sciophyllurn alaskaensis n. sp.; Ekvasophyllurn cf. E. inclinaturn Parks; Lithostrotionella 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 2. Chart showing lithologic and paleontologic symbols ubed in this report_- __ ------------------------------- 3 3. Generalized stratigraphic column for the Peratrovich Formation in the Peratrovich-Ladrones Islands region __ - 4 4. Photograph of the chert member at Cape Suspiro, 1.2 miles south of Craig, Alaska ___ ----------------------- 6 5. Photograph of the chert on the bedding surface in the lower part of the limestone and chert member, Toti Island ________________________________________________________________________________________ _ 6 6. Photograph of typical exposures of the lower part of the limestone and chert member on the southeast side of Totiisland ___________________________________________________________________________________ _ 6 7. Index map of fossil localities and stratigraphic sections and fossil localities, 66X-6, Toti Island and 66X-11 Madre de Dios Island ________________________________________________________________________________ _ 7 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 ___________________________________________ _ 8 9. Stratigraphic section 66X-6, Toti Island ____________________ ------------------------------------------ 9 nr IV CONTENTS Page FIGURE 10. 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 ibland 1 mile west of Shelikof Island________________________ 10 13. Graph showing variations in alar diameter and number of major septa in Ekvasophyllurn cf. E. inclinaturn Parks_ 12 14. Graph showing variations in alar diameter and number of major septa in Faberophyllurn williarnsi n. sp________ 15 15. Graph showing variations in corallite diameter and number of major septa in Lithostrotion (Siphonodendron) warreniNelson_________________________________________________________________________________ 19 16. Drawings of thin sections of Lithostrotion (Siphonodendron) warreni (Nelson)_______________________________ 19 17. Drawings of thin sections of Lithostrotion (Siphonodendron) succinctus n. sp_________________________________ 20 18. Graph showing variations in corallite diameter and number of major septa in Lithostrotion (Siphonodendron) succinctusn. SP--------------------------------------------------------------------------------- 21 19. Drawings of thin sections of Lithostrotion (Siphonodendron) sp____________________________________________ 22 20. Graph showing variations in corallite diameter and number of major septa in Lithostrotion (Siphonodendron) sp_ 23 21. Drawings of thin sections of Diphyphyllurn venosurn n. sp________________________________________________ 25 22. Graph showing variations in corallite diameter and number of major septa in Diphyphyllum venosurn n. sp. and Diphyphyllum klawockensis n. sp_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 26 23. Drawings of thin sections of Diphyphyllum klawockensisn. sp_____________________________________________ 27 24. Graph showing variations in corallite diameter and number of major septa in L£thostrotionella banffensis (Warren)_ 30 25. Graph showing variations in corallite diameter and number of major septa in Lithostrotionella pennsylvanica (Shimer)_______________________________________________________________________________________ 32 26. Drawings of thin sections of Lithostrotionella birdi n. sp__________________________________________________ 33 27. Graph showing variations in corallite diameter and number of major septa in Lithostrotionella birdi n. sp. and Lithostrotionella aff. L. mclareni Sutherland_________________________________________________________ 34 28. Drawings of thin sections of Lithostrotionella peratrovichensis n. sp __________________ - ___________ - _ _ _ _ _ _ _ _ _ _ 35 29. Graph showing variations in corallite diameter and number of major septa in holotype of Lithostrotionella peratrovichensis n. sp_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 36 30. Drawings of thin sections of Sciophyllum alaskaensis n. sp_______________________________________________ 39 TABLE Page TABLE 1. Classification of carbonate rocks according to depositional texture_--------------------------------------- a MISSISSIPPIAN RUGOSE CORALS, PERATROVICH FORMATION, WEST COAST PRINCE OF WALES ISLAND, SOUTHEASTERN ALASKA By AUGUSTUS K. ARMSTRONG 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 'Vales Island, Alaska, contains Survey has resulted in more detailed stratigraphic three membel's that represent continuous marine sedimenta studies and p~deontologic collections. These investiga tion from Osage into Chester time. The chert member, about 200 tions were conducted by G. D. Eberlein and Michael fe.et thick, rests disconforably on strata of Devonian age and is Chm·kin, Jr. during the field seasons of 1964-66. I composed of dark-gray radiolarian cherts, lime mudstones, and 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 gl'ay chert and of bryozoan, echinoderm, foraminiferal pian outcrops, measuring stratigraphic