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D9807 CO. Dobbin Summit (Ordovician of the United States)

Also known as USGS 9807-CO-D; Locality 90R-DS; Lower Antelope Valley Fm. at Dobin Summit, NV

Where: Nye County, Nevada (39.0° N, 116.5° W: paleocoordinates 5.9° S, 80.4° W)

• coordinate based on political unit

• outcrop-level geographic resolution

When: Anomalorthis other zone, Antelope Valley Formation, Whiterockian (471.8 - 457.5 Ma)

• Anomalorthis Zone (= Zone M), Kanoshian, middle Whiterockian. Histiodella sinuosa

• group of beds-level stratigraphic resolution

Environment/lithology: open shallow subtidal; dolomitic, silty limestone and burrowed siltstone

• silty, dolomitic limestone interbedded with horizontally burrowed siltstone. Apparent hardground surfaces observed on the tops of some of the limestone layers. Shelley layers are commonly separated by stromatolitic intervals.

Size classes: macrofossils, microfossils

Preservation: recrystallized, replaced with silica

Reposited in the USGS

Collection methods: quarrying,

Primary reference: D. M. Rohr. 1996. Ordovician (Whiterockian) gastropods of Nevada, Part 2. Journal of Paleontology 70(1):56-63 [A. Miller/R. Krause/P. Wagner] more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 14229: authorized by Arnold Miller, entered by Rich Krause on 28.05.2002, edited by Pete Wagner

Creative Commons license: CC BY (attribution)