Where: Santa Barbara County, California (38.7° N, 9.2° W: paleocoordinates 38.7° N, 10.7° W)
• coordinate estimated from map
When: Vaqueros Formation, Burdigalian (20.4 - 16.0 Ma)
• Vaqueros or Rincon formation
•Analyses of strontium concentrations and 87Sr/86Sr isotopes from well-preserved Lyropecten sp. shells provide an age estimate of 20.08±0.11 Ma for sedimentary strata spanning about 8.5 meters of section, with no systematic geochemical age differences between stratigraphically younger or older samples
Environment/lithology: marine; sandy conglomerate and mudstone
Size class: macrofossils
Primary reference: J. B. Paces, S. A. Minor, K. M. Schmidt and J. Hoffmann. 2023. Strontium Isotope Chronostratigraphic Age of a Sirenian Fossil Site on Santa Rosa Island, Channel Islands National Park, California. USGS Scientific Investigations Report 2023-5026:1-27 [M. Uhen/M. Uhen]more details
Purpose of describing collection: general faunal/floral analysis
PaleoDB collection 65486: authorized by Mark Uhen, entered by Mark Uhen on 22.09.2006
Creative Commons license: CC BY (attribution)
Taxonomic list
Mammalia | |
Dugongidae indet. Gray 1821 dugong |