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Middle-upper Cambrian trilobite bios...

Wasserman, Gregory James.

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Middle-upper Cambrian trilobite biostratigraphy of slope deposits, Paibi, western Hunan Province, China.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Middle-upper Cambrian trilobite biostratigraphy of slope deposits, Paibi, western Hunan Province, China./
作者:	Wasserman, Gregory James.
面頁冊數:	174 p.
附註:	Source: Dissertation Abstracts International, Volume: 60-05, Section: B, page: 2043.
Contained By:	Dissertation Abstracts International60-05B.
標題:	Paleontology. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9931696
ISBN:	9780599318694

Middle-upper Cambrian trilobite biostratigraphy of slope deposits, Paibi, western Hunan Province, China.
Wasserman, Gregory James.

Middle-upper Cambrian trilobite biostratigraphy of slope deposits, Paibi, western Hunan Province, China. - 174 p.

Source: Dissertation Abstracts International, Volume: 60-05, Section: B, page: 2043.

Thesis (Ph.D.)--The Ohio State University, 1999.

This item must not be sold to any third party vendors.

A stratigraphic section through limestones and siliciclastic mudrocks near the village of Paibi, western Hunan Province, China, is under consideration as the international stratotype for the Middle-Upper Cambrian boundary. This dissertation involves detailed study of the biostratigraphy of non-agnostoid trilobites from the Paibi section, and interpretation of biostratigraphic patterns.

ISBN: 9780599318694Subjects--Topical Terms:

518862
Paleontology.

Middle-upper Cambrian trilobite biostratigraphy of slope deposits, Paibi, western Hunan Province, China.
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245 1 0 $a Middle-upper Cambrian trilobite biostratigraphy of slope deposits, Paibi, western Hunan Province, China.
300 $a 174 p.
500 $a Source: Dissertation Abstracts International, Volume: 60-05, Section: B, page: 2043.
500 $a Adviser: Loren E. Babcock.
502 $a Thesis (Ph.D.)--The Ohio State University, 1999.
506 $a This item must not be sold to any third party vendors.
506 $a This item must not be added to any third party search indexes.
520 $a A stratigraphic section through limestones and siliciclastic mudrocks near the village of Paibi, western Hunan Province, China, is under consideration as the international stratotype for the Middle-Upper Cambrian boundary. This dissertation involves detailed study of the biostratigraphy of non-agnostoid trilobites from the Paibi section, and interpretation of biostratigraphic patterns.
520 $a The position of Middle-Upper Cambrian boundary is currently undecided, but is likely to be placed at the first appearance worldwide of the agnostoid trilobite Glyptagnostus reticulatus. In North America, the base of the Glyptagnostus reticulatus Interval-zone corresponds to the base of the Pterochepaliid Biomere.
520 $a A biomere is a stratigraphic interval whose base is identified by an evolutionary radiation and whose top is marked by a mass extinction event. Biomeres are assumed to have worldwide significance (although they are best studied in North America), and the bases of biomeres are assumed to represent post-extinction recoveries. The Paibi section, China, records one of the most complete successions of Middle-Upper Cambrian strata known anywhere in the world. The section represents a slope environment adjacent to the Yangtze (South China) Platform. Because of its completeness, and its paleogeographic position, it offers an excellent opportunity to test for biomere patterns outside Laurentia (ancestral North America-Greenland), and in a shelf-margin environment. The characteristic "biomere" pattern of relatively slow evolutionary diversification followed by rapid mass extinction is not evident in the Piabi section. One possibility for this is that a rise in sea level or a rise in a thermocline and inundation of the shelf with cold or dysoxic water would have pronounced effects in a shelf environment but little effect in a slope environment. A more likely possibility involves downslope movement and resedimentation of trilobite sclerites through gravity displacement on the slope. Many species' apparent ranges would have extended beyond their true ranges, effectively obscuring any sharp biostratigraphic boundary that may have existed and that may have been retained in shallow, nearly horizontal, shelf strata.
590 $a School code: 0168.
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650 4 $a Geology. $3 516570
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710 2 $a The Ohio State University. $3 718944
773 0 $t Dissertation Abstracts International $g 60-05B.
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791 $a Ph.D.
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