Bulletin - United States Geological Survey Volume 485

9781232398226: Bulletin - United States Geological Survey Volume 485

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1912 Excerpt: ... bearing the former fauna, and hence it may be most reasonably interpreted as the basal conglomerate of the Upper Jurassic. Paige and Knopf have described a conglomerate of similar lithology and at about the same stratigraphic position, occurring in the Upper Matanuska Valley.1 NAKNEK FORMATION. Areal distribution.--The Naknek formation occupies the west shore of Cook Inlet from Chisik Island to Iniskin Bay and much of the shore from the mouth of Iliamna Bay to a point about midway of the south shore of Kamishak Bay. The continuity of exposure is interrupted by older rocks on Tuxedni Bay, Chinitna Bay, Oil Bay, Iniskin Bay, Iliamna Bay, Ursus Cove, and Bruin Bay, and probably also near the head of Kamishak Bay. Lithologic character and sections.--The Naknek formation which overlies the Chisik conglomerate, or in its absence rests upon the Chinitna shale, consists of about 5,000 feet of shale, sandstone, arkose, andesitic tuff, and conglomerate. The following sections show the local lithologic character of this formation: Section of Naknek formation on the north shore of Chinitna Bay. 1. Coarse conglomerate with 6-inch (maximum) granite pebbles and smaller pebbles of various lithologic Feet. character, in a tuffaceous or arkose matrix 10 2. Shaly arkose or sandstone 2 3. Conglomerate 2J 4. Arkosic sandstone or andesitic tuff 1$ 5. Conglomerate i 6. Massive tuffaceous rock with numerous inclusions 9 7. Tuffaceous rock with much shale 3 8. Andesitic flow or tuff 12 9. Shale 2 10. Concealed 10 11. Andesitic flow or tuff 15 12. Concealed 5 13. Contorted shale with large Belemnites at base 23 14. Sandstone J 15. Shale i 16. Andesitic flow or tuff 4J 17. Contorted shale with concretions 3 18. Arkose with granite pebbles at top 7 19. Sandy shale 2 20. Sandy shale w...

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