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).Diligencia Formation at Fossilworks.org
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.Coffey et al., 2019, p.481Canyon Spring at Fossilworks.org
Fossil content The formation has provided the following fossils: Mammals Artiodactyls Merycoidodontidae Merychyus cf. minimusWoodburne & Whistler, 1973
See also
List of fossiliferous stratigraphic units in California Paleontology in California Plush Ranch Formation Tick Canyon Formation
References
Bibliography