Also known as UCR RV-6421; UCMP RV6421; United States Borax and Chemical Corporation mine; Rio Tinto Borax mine

Where: San Bernardino County, California (35.1° N, 117.7° W: paleocoordinates 36.0° N, 114.2° W)

• coordinate based on political unit

• small collection-level geographic resolution

When: Arkose Member (Kramer Beds Formation), Early/Lower Hemingfordian (20.4 - 16.0 Ma)

Environment/lithology: fluvial; micaceous, volcaniclastic, brown claystone and silty sandstone

Size classes: macrofossils, mesofossils

Collected in 1964

• "Fossils of the Boron Local Fauna were not observed at the original site of deposition by the author. They were first noticed by several mine employees operating heavy equip- ment removing overburden from the open pit mine. The mine foreman informed the geology staff who had the remaining fossil-bearing matrix dumped in a separate location from the general mine dump so that the fossils could be recovered. It is not certain how much of the fossil-bearing pocket was lost before this action was taken, but 4-5 earth-mover loads (12-15 cubic meters) were subsequently recovered before the pocket stopped producing readily visible fossil bone."

Primary reference: D. P. Whistler. 1984. Boron Local Fauna. Contributions in Science, Natural History Museum of Los Angeles County 355:1-36 [J. Alroy/J. Alroy/M. Uhen]more details

Purpose of describing collection: general faunal/floral analysis

PaleoDB collection 19194: authorized by John Alroy, entered by John Alroy on 18.02.1993, edited by Patricia Holroyd

Creative Commons license: CC BY (attribution)