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Diligencia Formation

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Diligencia Formation
Stratigraphic range: Late Oligocene-Early Miocene (Arikareean)
~25–20.4 Ma PreꞒ Ꞓ O S D C P T J K Pg N ↓
TypeFormation
OverliesProterozoic augen gneiss (basement)
Maniobra Formation (in the north)
Thickness1,500 m (4,900 ft)
Lithology
PrimaryConglomerate, sandstone, siltstone, limestone
OtherInterbedded basalt and andesite
Location
Coordinates33°30′N 115°42′W / 33.5°N 115.7°W / 33.5; -115.7
Approximate paleocoordinates32°12′N 107°30′W / 32.2°N 107.5°W / 32.2; -107.5
RegionCalifornia
Country United States
ExtentOrocopia Mountains
Type section
Named byCrowell
Year defined1975
Diligencia Formation is located in the United StatesDiligencia FormationDiligencia Formation (the United States)Show map of the United StatesDiligencia Formation is located in CaliforniaDiligencia FormationDiligencia Formation (California)Show map of California

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

References

  1. ^ Diligencia Formation at Fossilworks.org
  2. Coffey et al., 2019, p.481
  3. Canyon Spring at Fossilworks.org
  4. Woodburne & Whistler, 1973

Bibliography

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