VAL 139/140/141 Bird Spring Fm., Arrow Canyon (Carboniferous of the United States)

Where: Clark County County, Nevada (36.7° N, 114.8° W: paleocoordinates 3.4° N, 43.0° W)

• coordinate estimated from map

• outcrop-level geographic resolution

When: Bird Spring Formation, Moscovian (315.2 - 307.0 Ma)

• Basal Desmoinesian is equivalent to Moscovian at Arrow Canyon according to Bishop et al., 2010 (Geosphere 6:1-34)

• group of beds-level stratigraphic resolution

Environment/lithology: shallow subtidal; lithified, massive, fine-grained, gray, argillaceous, cherty/siliceous limestone

• Nodular massive to shaly, fine-grained, argillaceous limestone; discontinuous layering of cobble to smaller size, orange brown chert; complete fossils are scarce; gray weathering to tannish gray; less resistant near base; irregular bench former; partially covered at base;

Size class: macrofossils

Preservation: replaced with silica

Collection methods: bulk, chemical

Primary reference: G. S. Roadcap, J. C. Yarnold, and R. L. Langenheim, Jr. 1988. Brachiopods in the basal Desmoinesian at Arrow Canyon, Clark County, Nevada. Transactions of the Illinois Academy of Science 81(3 and 4):231-246 [N. Bonuso/P. Monarrez]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 142095: authorized by Nicole Bonuso, entered by Pedro Monarrez on 05.04.2013

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Rhynchonellata
 Spiriferida - Trigonotretidae
"Neospirifer alatus" = Neospirifer triplicatus alatus
"Neospirifer alatus" = Neospirifer triplicatus alatus Dunbar and Condra 1932