Webster Unit 26A, Bird Spring Fm. (Carboniferous of the United States)

Where: Clark County, Nevada (36.7° N, 114.8° W: paleocoordinates 0.1° N, 46.9° W)

• coordinate estimated from map

• outcrop-level geographic resolution

When: Bird Spring Formation, Serpukhovian (330.9 - 323.2 Ma)

• Chesterian is equivalent to Serpukhovian at Arrow Canyon according to Bishop et al., 2009 (Palaeogeography, Palaeoclimatology, Palaeoecology 276:217–243

• bed-level stratigraphic resolution

Environment/lithology: shallow subtidal; lithified, coarse-grained, gray limestone

• Limestone, light grey, weathers same, medium- to thin-bedded at bottom, coarse-grained.

Size class: macrofossils

Preservation: replaced with silica

Collection methods: bulk, chemical

Primary reference: D. W. Petersen and R. L. Langenheim, Jr. 1984. Spiriferellina lata Lane in the Uppermost Chesterian in the Bird Spring Group at Arrow Canyon, Clark County, Nevada. Transactions of the Illinois Academy of Sciences 77(3 and 4):207-218 [N. Bonuso/P. Monarrez]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 141783: authorized by Nicole Bonuso, entered by Pedro Monarrez on 01.04.2013

Creative Commons license: CC BY (attribution)

Taxonomic list

Rhynchonellata
 Spiriferinida - Spiriferellinidae