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)

• Lower 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 John Gibron; reposited in the LACM

• Other material in private collection of John Gibron.

Primary reference: W. D. Pierce. 1963. Fossil arthropods of California no. 25. Silicified leafhoppers from California mountains nodules. Bulletin of the Southern California Academy of Sciences 62:69-82 [M. Clapham/M. Clapham]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 152200: authorized by Matthew Clapham, entered by Matthew Clapham on 11.11.2013

Creative Commons license: CC BY (attribution)