Diligencia Formation
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The Diligencia Formation (Td) is a geologic formation cropping out in the Orocopia Mountains in southern California. It preserves mammal fossils dating to the Late Oligocene to Early Miocene (Arikareean in the NALMA classification).
Description
The non-marine Diligencia Formation, defined by Crowell in 1975, is composed of alluvial, fluvial, and lacustrine conglomerates, sandstones, siltstones and limestones. It contains interbedded basalt and andesite flows, dated by whole-rock and plagioclase K-Ar methods as ca. 24–21 Ma), and andesitic sills and dikes.
Fossil content
The formation has provided the following fossils:
Mammals
See also
- List of fossiliferous stratigraphic units in California
- Paleontology in California
- Plush Ranch Formation
- Tick Canyon Formation
Bibliography
- Coffey, Kevin T.; Ingersoll, Raymond V.; Schmitt, Axel K. (2019), , Geosphere, 15 (2): 479–501, Bibcode:, doi:
- Woodburne, M. O.; Whistler, D. P. (1973), "An Early Miocene Oreodont (Merychyinae, Mammalia) from the Orocopia Mountains, Southern California", Journal of Paleontology, 47: 908–912