USGS Cenozoic 19064a, Mule Canyon, Calico Hills (Miocene of the United States)

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)

• Middle nodule zone, about 13 feet lower than 19063 and below a prominent gypsum ledge. 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

• Brown- and green-weathering siltstone and brown shale including five beds of nodules (loc. 19064a-e)—middle nodule zone

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 123033: authorized by Matthew Clapham, entered by Matthew Clapham on 10.01.2012

Creative Commons license: CC BY (attribution)

Taxonomic list

Insecta
 Thysanoptera - Thripidae
Thripidae indet. Stevens 1829 thrips
 Coleoptera - Dytiscidae
Schistomerus californense Palmer 1957 predaceous diving beetle
 Diptera - Ceratopogonidae
Dasyhelea antiqua Palmer 1957 biting midge
Branchiopoda
 Anostraca -
Anostraca indet. Sars 1867 branchiopod
Arachnida
 Acariformes -