Diligencia Formation

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Diligencia Formation
Stratigraphic range: Late Oligocene-Early Miocene (Arikareean)
~25–20.4  Ma
Ꞓ
O
S
D
C
P
T
J
K
Pg
N
↓
Type Formation
Overlies Proterozoic augen gneiss (basement)
Maniobra Formation (in the north)
Thickness1,500 m (4,900 ft)
Lithology
Primary Conglomerate, sandstone, siltstone, limestone
OtherInterbedded basalt and andesite
Location
Coordinates 33°30′N115°42′W / 33.5°N 115.7°W / 33.5; -115.7
Approximate paleocoordinates 32°12′N107°30′W / 32.2°N 107.5°W / 32.2; -107.5
Region California
Country United States
Extent Orocopia Mountains
Type section
Named byCrowell
Year defined1975
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Diligencia Formation (the United States)
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Diligencia Formation (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). [1]

Contents

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. [2] [3]

Fossil content

The formation has provided the following fossils: [1]

Mammals

See also

References

  1. 1 2 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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