Diligencia Formation
{{Infobox rockunit
| name = Diligencia Formation
| image =
| caption =
| type = Formation
| age = Late Oligocene-Early Miocene (Arikareean)
~{{fossil range|25|20.4}}
| period = Aquitanian
| prilithology = Conglomerate, sandstone, siltstone, limestone
| otherlithology = Interbedded basalt and andesite
| namedfor =
| namedby = Crowell
| year_ts = 1975
| region = California
| country = United States
| coordinates = {{coord|33.5|N|115.7|W|display=inline,title}}
| paleocoordinates = {{coord|32.2|N|107.5|W|display=inline}}
| unitof =
| subunits =
| underlies =
| overlies = Proterozoic augen gneiss (basement)
Maniobra Formation (in the north)
| thickness = {{convert|1500|m|ft|abbr=on}}
| extent = Orocopia Mountains
| area =
| map = {{Location map+ | United States#California
| relief = 1
| width = 250
| float = center
| places =
{{Location map~ | United States#California
| lat_deg = 33.5
| lon_deg = -115.7
| mark = Yellow pog.svg
| marksize = 12
}}
}}
| map_caption =
}}
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).[https://paleobiodb.org/classic/displayStrata?geological_group=&formation=Diligencia&group_formation_member=Diligencia 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.481[https://paleobiodb.org/classic/displayCollResults?collection_no=17765 Canyon Spring] at Fossilworks.org
Fossil content
See also
{{div col|colwidth=29em}}
- List of fossiliferous stratigraphic units in California
- Paleontology in California
- Plush Ranch Formation
- Tick Canyon Formation
{{div col end}}
References
{{reflist|3}}
= Bibliography =
- {{citation |last1=Coffey |first1=Kevin T. |first2=Raymond V. |last2=Ingersoll |first3=Axel K. |last3=Schmitt |year=2019 |title=Stratigraphy, provenance, and tectonic significance of the Punchbowl block, San Gabriel Mountains, California, USA |url=https://pubs.geoscienceworld.org/gsa/geosphere/article/15/2/479/568356/Stratigraphy-provenance-and-tectonic-significance |journal=Geosphere |volume=15 |issue=2 |pages=479–501|doi=10.1130/GES02025.1 |bibcode=2019Geosp..15..479C |doi-access=free }}
- {{citation |last1=Woodburne |first1=M. O. |first2=D. P. |last2=Whistler |year=1973 |title=An Early Miocene Oreodont (Merychyinae, Mammalia) from the Orocopia Mountains, Southern California |journal=Journal of Paleontology |volume=47 |pages=908–912}}
Category:Geologic formations of California
Category:Miocene Series of North America
Category:Oligocene Series of North America
Category:Sandstone formations of the United States
Category:Conglomerate formations of the United States
Category:Shale formations of the United States
Category:Siltstone formations of the United States