Where: California (34.9° N, 116.8° W: paleocoordinates 34.1° N, 111.3° W)

• coordinate estimated from map

• small collection-level geographic resolution

When: Calico Member (Barstow Formation), Hemingfordian (20.4 - 16.0 Ma)

• Upper nodule zone. Overlying fine-grained lacustrine beds (here referred to as the Calico Member of the Barstow Formation) are bracketed between ca. 19 and 16.9 Ma, and are thus older than the type section of the Barstow Formation in the Mud Hills. Several 17.1–16.8 Ma calc-alkaline dacite domes intrude the Calico Member.

• group of beds-level stratigraphic resolution

Environment/lithology: lacustrine - large; lithified, nodular, brown shale

Size classes: macrofossils, mesofossils

Preservation: replaced with calcite, replaced with silica, replaced with other

Collected by A.R. Palmer, J.A. Patten in 1954

Primary reference: A. R. Palmer. 1957. Miocene arthropods from the Mojave desert, California. United States Geological Survey Professional Paper 294-G:237-280 [M. Clapham/M. Clapham]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 123032: authorized by Matthew Clapham, entered by Matthew Clapham on 10.01.2012

Creative Commons license: CC BY (attribution)