Where: Kern County, California (35.3° N, 119.3° W: paleocoordinates 34.5° N, 115.0° W)
• coordinate based on nearby landmark
• basin-level geographic resolution
When: Upper Member (Round Mountain Silt Formation), Middle Miocene (16.0 - 11.6 Ma)
• The Round Mountain Silt is unconformably overlain by the Santa Margarita Formation; the contact is placed at the base of a massive sand that overlies sandy siltstone. The contact with the underlying Oclese sand is drawn at the toip of a very fine silty sand. The upper units of the formation comprises 120 ft of light-gray to greenbish-black clayey siltstone.
• member-level stratigraphic resolution
Environment/lithology: offshore; gray, silty, sandy shale
Size class: macrofossils
Reposited in the CAS, LACM, UCMP
Collection methods: quarrying,
• Collections housed at various institutes: USGS (Wasington and Menlo Park), UCMP, LACM, CAS, Stanford University, UCLA, UCR.
Primary reference: W.O. Addicott. 1970. Miocene Gastropods and Biostratigraphy of the Kern River Area, California. United States Geological Survey Professional Paper 642:1-172 [A. Miller/A. Hendy/A. Hendy]more details
Purpose of describing collection: taxonomic analysis
PaleoDB collection 38042: authorized by Austin Hendy, entered by Austin Hendy on 02.04.2004
Creative Commons license: CC BY (attribution)