Barrel Spring, Bed D1017CO/D1477CO (Ordovician of the United States)

Where: California (37.0° N, 118.0° W: paleocoordinates 6.8° S, 81.9° W)

• coordinate estimated from map

• hand sample-level geographic resolution

When: Barrel Spring Formation, Caradoc (458.4 - 449.5 Ma)

• Listed as Lower Caradoc; local series:Porterfield age; C37, C40

• group of beds-level stratigraphic resolution

Environment/lithology: lagoonal; poorly lithified, lenticular shale and lithified, lenticular mudstone

• Lagoonal?
• Thinly-laminated and shaly to flaggy, grayish-black shale and mudstone, weathers to dark reddish brown or silvery gray

Size classes: macrofossils, mesofossils

Collected by Wilfrid Davis; reposited in the USNM

Primary reference: R. J. Ross, Jr. and C. R. Longwell. 1964. Middle and Lower Ordovician Formations in Southernmost Nevada and Adjacent California. United States Geological Survey Bulletin 1180-C:C1-C101 [S. Finnegan/S. Finnegan/J. Marcot]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 77182: authorized by Phil Novack-Gottshall, entered by Paul Hearn on 28.12.2007, edited by Jonathan Marcot

Creative Commons license: CC BY (attribution)

Taxonomic list

• Porterfield age; Dicellograptus sextans zone: correlated with N. gracilis and C. bicornis
Rhynchonellata
 Orthida - Orthidae
Orthambonites sp. Pander 1830
 Orthida - Hesperorthidae
 Orthida - Plaesiomyidae
Bryozoa
  -
Bryozoa indet. Ehrenberg 1831
Trilobita
 Asaphida - Asaphidae
"Isotelus spurius" = Anataphrus spurius
"Isotelus spurius" = Anataphrus spurius Phleger 1933 trilobite
 Trinucleida - Raphiophoridae
Ampyx sp. Dalman 1827 trilobite
Lonchodomas sp. Angelin 1854 trilobite