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A conodont-based standard reference section in central Nevada for the lower Middle Ordovician Whiterockian Series

Bulletins of American Paleontology

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Abstract

Ranges of conodonts in stratigraphic sections at five localities in the Monitor and Antelope ranges of central Nevada are used graphically to assemble a standard reference section for the lower Middle Ordovician Whiterockian Series. The base of the series is officially 0.3 m above the base of the Antelope Valley Limestone in the stratotype in Whiterock Canyon (Monitor Range). The top is the level at which Baltoniodus gerdae makes a brief appearance in an exposure of the Copenhagen Formation on the flanks of Hill 8308 in the western Antelope Range. Graphic compilation of the sections considered in this report also indicates that a level correlative with the base of the Whiterockian Series in the stratotype section is 66 m above the base of the Antelope Valley Limestone in its de facto type section on Martin Ridge in the eastern part of the Monitor Range. Ranges, diversity, and the composition of the conodont faunas differ markedly in lithofacies adjacent to the basal boundary of the series; hence we are unable to identify a single conodont species, in a credible developmental sequence, to serve as biological marker of that boundary.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
A conodont-based standard reference section in central Nevada for the lower Middle Ordovician Whiterockian Series
Series title:
Bulletins of American Paleontology
Volume
2005
Issue:
369
Year Published:
2005
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Bulletins of American Paleontology
First page:
35
Last page:
48
Number of Pages:
14