Stratigraphy of the silurian and devonian rocks, Northwestern Pend Oreille County, Washington Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/v405sd99x

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  • Silurian and Devonian rocks are exposed for approximately 8 square kilometers inthe KootenayArc structural province of northeastem Washington. These Middle Paleozoic rocks overlie the Upper Cambrian Metaline Limestone and the Ordovician Ledbetter Formation, which includes slates, siltstones, and limestones. Two Silurian units crop out in this area. Unit A is composed of Lower Silurian graptolitic argillites and siltstones and Upper Silurian siltstones and fossiliferous limestone. These lithologies represent a trend towards shallower water conditions than those operative during deposition of the Ledbetter Formation. Above Unit A lies the quartz granule conglomerate Unit. This unit consists of a silica rich granule conglomerate with associated beds of slate and is interpreted as an inner submarine fan deposit. Devonian rocks are found locally at Limestone Hill. The polymictic Givetian limestone conglomerate crops out at the base of the bill. This conglomerate contains limestone clasts of Lower and lower Middle Devonian rocks, thereby documenting a break in the sedimentary record. The Givetian limestone occurs as float fragments of dark-gray limestone, which preserve a diverse conodont fauna. On the crest of Limestone Hill lies the Frasnian massive and bedded lime stones, which are believed to represent a reef build-up. The post-Paleozoic sedimentary record consists of Quaternary glacial deposits. An olivine trachybasalt of probable Tertiary age crops out for a short distance in the central portion of the map area. The region has undergone several periods of deformation of probable Mesozoic age. The structure is dominated by northeast and northerly trending folds, and northeast and northerly trending steeply dipping normal faults.
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  • Thesis file scanned at 300 ppi (Monochrome) using Capture Perfect 3.0.82 on a Canon DR-9080C in PDF format. CVista PdfCompressor 4.0 was used for pdf compression and textual OCR. Plates: Master map file scanned at 600 dpi, 24-bit color on a Paradigm ImagePRO GxT 42 HD (OEM version of ColortracSmartLF Bx 42). Image manipulated by SmartLF1.3.05. For master (tiff) digital images of maps contained in this document contact scholarsarchive@oregonstate.edu
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  • description.provenance : Made available in DSpace on 2011-07-27T19:06:00Z (GMT). No. of bitstreams: 3 Map2.jpg: 15339675 bytes, checksum: a016463863d2f23f937334fc8e37ed50 (MD5) Map1.jpg: 9475502 bytes, checksum: f0c0ccd791bcd85309626df0ef44f387 (MD5) GreenmanCelia1977.pdf: 3901129 bytes, checksum: d78f4626b902413a3f681627f28e266c (MD5) Previous issue date: 1976-12-17
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  • description.provenance : Approved for entry into archive by Patricia Black(patricia.black@oregonstate.edu) on 2011-07-27T19:06:00Z (GMT) No. of bitstreams: 3 Map2.jpg: 15339675 bytes, checksum: a016463863d2f23f937334fc8e37ed50 (MD5) Map1.jpg: 9475502 bytes, checksum: f0c0ccd791bcd85309626df0ef44f387 (MD5) GreenmanCelia1977.pdf: 3901129 bytes, checksum: d78f4626b902413a3f681627f28e266c (MD5)

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