Graduate Thesis Or Dissertation

Taxonomy and ecology of atrypella spp. and the atrypella community Public Deposited

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Citeable URL: https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/dn39x5263

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Attribute Name	Values
Creator	Smith, Roy Edward
Abstract	Two measured sections of the upper Silurian Douro Formation from Devon Island, N.W.T. were examined for their faunal content with emphasis on the paleoecology and taxonomy of the fauna. Atrypella is believed to have lived with its beaks embedded in the muddy substrate of a somewhat restricted environment. Intermittent, low velocity currents caused disarticulation within the members of the Atrypella community and resulted in members of adjacent communities being swept in. The Atrypella Community has low faunal diversity and high density; the bulk of the Community being composed of Atrypella app., Protathyris spp. and Howellella sp. A crude zonation exists within Atrypella spp. from Arctic Canada, but more precise age dating, perhaps utilizing conodonts, is needed to clear up uncertainties. From this study, Atrypella spp. was found to be restricted to the Ludlow and Pridoli stages of the Silurian System in both North America and Eurasia. In latest Wenlock or earliest Ludlow time, two broad lineages of Atrypella evolved possibly from Cryptatrypa. One lineage was characterized by forms similar to and including A. scheii (Holtedahl). The second lineage was characterized by forms similar to and including A. prunum (Dalman). In late Pridoli time, conditions favourable for the existence of Atrypella spp. began to deteriorate and by the end of Pridoli time, both lineages had become extinct.
Resource Type	Masters Thesis
Date Available	2014-02-21T19:12:58+00:00
Date Issued	1972-12-13
Degree Level	Master's
Degree Name	Master of Science (M.S.)
Degree Field	Geology
Degree Grantor	Oregon State University
Commencement Year	1973
Advisor	Boucot, A. J.
Academic Affiliation	Geology
Non-Academic Affiliation	Oregon State University. Graduate School
Subject	Atrypella
Rights Statement	Copyright Not Evaluated
Publisher	Oregon State University
Peer Reviewed	No
Language	English [eng]
Digitization Specifications	File scanned at 300 ppi (Monochrome, 24-bit Color) 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.
Replaces	http://hdl.handle.net/1957/46043
Additional Information	description.provenance : Approved for entry into archive by Patricia Black(patricia.black@oregonstate.edu) on 2014-02-21T19:12:58Z (GMT) No. of bitstreams: 11 SmithRoyE19730000.pdf: 4135435 bytes, checksum: a629fb31f506fb4823ffb2db82b4954e (MD5) Smith1973fig13.jpg: 2506049 bytes, checksum: c390161963af2073361b07eab02de377 (MD5) Smith1973fig14.jpg: 2063827 bytes, checksum: 61bd6aea6ec2d85d6bc557175f872d8c (MD5) Smith1973fig15.jpg: 756474 bytes, checksum: 18d544e2af515a3187d27ac21f171ecb (MD5) Smith1973fig16.jpg: 706150 bytes, checksum: 8ded9da8de9d7f723d609a2b3abc9f96 (MD5) Smith1973fig17.jpg: 2575865 bytes, checksum: b6663948be70823beda96ec5072d3f20 (MD5) Smith1973fig18.jpg: 665626 bytes, checksum: 5fd77340f722d77dbade7d5e43ec8b2d (MD5) Smith1973fig19.jpg: 638328 bytes, checksum: 60de35523ae5b024e55c4625a144f551 (MD5) Smith1973fig20.jpg: 934118 bytes, checksum: be441fdee350c3be51026c623c3c71e5 (MD5) Smith1973fig21.jpg: 704138 bytes, checksum: 7b7d775ffe01642f09b75c4a4be7e76d (MD5) Smith1973fig22.jpg: 2068613 bytes, checksum: 4e7eca226b0b005d21ccd08714ae7a90 (MD5) description.provenance : Made available in DSpace on 2014-02-21T19:12:58Z (GMT). No. of bitstreams: 11 SmithRoyE19730000.pdf: 4135435 bytes, checksum: a629fb31f506fb4823ffb2db82b4954e (MD5) Smith1973fig13.jpg: 2506049 bytes, checksum: c390161963af2073361b07eab02de377 (MD5) Smith1973fig14.jpg: 2063827 bytes, checksum: 61bd6aea6ec2d85d6bc557175f872d8c (MD5) Smith1973fig15.jpg: 756474 bytes, checksum: 18d544e2af515a3187d27ac21f171ecb (MD5) Smith1973fig16.jpg: 706150 bytes, checksum: 8ded9da8de9d7f723d609a2b3abc9f96 (MD5) Smith1973fig17.jpg: 2575865 bytes, checksum: b6663948be70823beda96ec5072d3f20 (MD5) Smith1973fig18.jpg: 665626 bytes, checksum: 5fd77340f722d77dbade7d5e43ec8b2d (MD5) Smith1973fig19.jpg: 638328 bytes, checksum: 60de35523ae5b024e55c4625a144f551 (MD5) Smith1973fig20.jpg: 934118 bytes, checksum: be441fdee350c3be51026c623c3c71e5 (MD5) Smith1973fig21.jpg: 704138 bytes, checksum: 7b7d775ffe01642f09b75c4a4be7e76d (MD5) Smith1973fig22.jpg: 2068613 bytes, checksum: 4e7eca226b0b005d21ccd08714ae7a90 (MD5) Previous issue date: 1972-12-13 description.provenance : Submitted by Lauren Kaysen (lkscannerosu@gmail.com) on 2014-02-18T00:11:47Z No. of bitstreams: 11 SmithRoyE19730000.pdf: 4135435 bytes, checksum: a629fb31f506fb4823ffb2db82b4954e (MD5) Smith1973fig13.jpg: 2506049 bytes, checksum: c390161963af2073361b07eab02de377 (MD5) Smith1973fig14.jpg: 2063827 bytes, checksum: 61bd6aea6ec2d85d6bc557175f872d8c (MD5) Smith1973fig15.jpg: 756474 bytes, checksum: 18d544e2af515a3187d27ac21f171ecb (MD5) Smith1973fig16.jpg: 706150 bytes, checksum: 8ded9da8de9d7f723d609a2b3abc9f96 (MD5) Smith1973fig17.jpg: 2575865 bytes, checksum: b6663948be70823beda96ec5072d3f20 (MD5) Smith1973fig18.jpg: 665626 bytes, checksum: 5fd77340f722d77dbade7d5e43ec8b2d (MD5) Smith1973fig19.jpg: 638328 bytes, checksum: 60de35523ae5b024e55c4625a144f551 (MD5) Smith1973fig20.jpg: 934118 bytes, checksum: be441fdee350c3be51026c623c3c71e5 (MD5) Smith1973fig21.jpg: 704138 bytes, checksum: 7b7d775ffe01642f09b75c4a4be7e76d (MD5) Smith1973fig22.jpg: 2068613 bytes, checksum: 4e7eca226b0b005d21ccd08714ae7a90 (MD5) description.provenance : Approved for entry into archive by Patricia Black(patricia.black@oregonstate.edu) on 2014-02-18T16:22:55Z (GMT) No. of bitstreams: 11 SmithRoyE19730000.pdf: 4135435 bytes, checksum: a629fb31f506fb4823ffb2db82b4954e (MD5) Smith1973fig13.jpg: 2506049 bytes, checksum: c390161963af2073361b07eab02de377 (MD5) Smith1973fig14.jpg: 2063827 bytes, checksum: 61bd6aea6ec2d85d6bc557175f872d8c (MD5) Smith1973fig15.jpg: 756474 bytes, checksum: 18d544e2af515a3187d27ac21f171ecb (MD5) Smith1973fig16.jpg: 706150 bytes, checksum: 8ded9da8de9d7f723d609a2b3abc9f96 (MD5) Smith1973fig17.jpg: 2575865 bytes, checksum: b6663948be70823beda96ec5072d3f20 (MD5) Smith1973fig18.jpg: 665626 bytes, checksum: 5fd77340f722d77dbade7d5e43ec8b2d (MD5) Smith1973fig19.jpg: 638328 bytes, checksum: 60de35523ae5b024e55c4625a144f551 (MD5) Smith1973fig20.jpg: 934118 bytes, checksum: be441fdee350c3be51026c623c3c71e5 (MD5) Smith1973fig21.jpg: 704138 bytes, checksum: 7b7d775ffe01642f09b75c4a4be7e76d (MD5) Smith1973fig22.jpg: 2068613 bytes, checksum: 4e7eca226b0b005d21ccd08714ae7a90 (MD5)

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Graduate Theses and Dissertations (GTD)

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	Smith1973fig21.jpg	08/23/2017	Public
	Smith1973fig22.jpg	08/23/2017	Public
	SmithRoyE1973.pdf	08/23/2017	Public
	Smith1973fig13.jpg	08/23/2017	Public
	Smith1973fig14.jpg	08/23/2017	Public
	Smith1973fig15.jpg	08/23/2017	Public
	Smith1973fig16.jpg	08/23/2017	Public
	Smith1973fig17.jpg	08/23/2017	Public
	Smith1973fig18.jpg	08/23/2017	Public
	Smith1973fig19.jpg	08/23/2017	Public