Diligencia Formation
Jump to navigation
Jump to search
| Diligencia Formation | |
|---|---|
| Stratigraphic range: Late Oligocene-Early Miocene (Arikareean) ~ | |
| Type | Formation |
| Overlies | Proterozoic augen gneiss (basement) Maniobra Formation (in the north) |
| Thickness | 1,500 m (4,900 ft) |
| Lithology | |
| Primary | Conglomerate, sandstone, siltstone, limestone |
| Other | Interbedded basalt and andesite |
| Location | |
| Coordinates | Lua error in Module:Coordinates at line 489: attempt to index field 'wikibase' (a nil value). |
| Approximate paleocoordinates | Lua error: callParserFunction: function "#coordinates" was not found. |
| Region | California |
| Country | United States |
| Extent | Orocopia Mountains |
| Type section | |
| Named by | Crowell |
| Year defined | 1975 |
Diligencia Formation (the United States) 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]
Description
[edit | edit source]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
[edit | edit source]The formation has provided the following fossils:[1]
- Mammals
See also
[edit | edit source]References
[edit | edit source]- ^ a b Diligencia Formation at Fossilworks.org
- ^ Coffey et al., 2019, p.481
- ^ Canyon Spring at Fossilworks.org
- ^ Woodburne & Whistler, 1973
Bibliography
[edit | edit source]- Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
Categories:
- Geologic formations of California
- Miocene Series of North America
- Oligocene Series of North America
- Miocene California
- Paleogene California
- Chattian Stage
- Aquitanian (stage)
- Sandstone formations of the United States
- Conglomerate formations of the United States
- Shale formations of the United States
- Siltstone formations of the United States
- Oligocene volcanism
- Alluvial deposits
- Fluvial deposits
- Lacustrine deposits
- Paleontology in California
- Andesite formations
- Basalt formations