• Source: Diligencia Formation

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
Artiodactyls
Merycoidodontidae
Merychyus cf. minimus




See also






References






= Bibliography

=
Coffey, Kevin T.; Ingersoll, Raymond V.; Schmitt, Axel K. (2019), "Stratigraphy, provenance, and tectonic significance of the Punchbowl block, San Gabriel Mountains, California, USA", Geosphere, 15 (2): 479–501, Bibcode:2019Geosp..15..479C, doi:10.1130/GES02025.1
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

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