Mission Valley Formation
Mission Valley Formation | |
---|---|
Stratigraphic range: Paleogene | |
Type | Geologic formation |
Underlies | Pomerado Conglomerate |
Overlies | Stadium Conglomerate |
Thickness | 0–60 metres (0–197 ft) |
Lithology | |
Primary | sandstone |
Location | |
Region | San Diego County, California |
Country | United States |
Type section | |
Named for | Mission Valley, San Diego |
The Mission Valley Formation is a marine sandstone geologic formation in the Mission Valley region of southwestern San Diego County in Southern California.[1][2]
Geology
The formation's sandstone characteristics are: soft and friable, light olive gray, fine to medium grained, and composed mostly of quartz and potassium feldspar.[1] The Mission Valley Formation thins from the west to the east, with a maximum thickness of 0–60 metres (0–197 ft).[1]
It overlies the Stadium Conglomerate formation, and underlies the Pomerado Conglomerate formation.[1]
Fossil content
It preserves fossils dating back to the Paleogene period of the Cenozoic Era.[3] The formation's rocks can contain a molluscan fauna in the western and central exposures and a land-mammal fauna in the eastern exposures.[1]
Mammals
Eulipotyphlans
Eulipotyphlans reported from the Mission Valley Formation | |||||
---|---|---|---|---|---|
Genus | Species | Presence | Material | Notes | Images |
Proterixoides | P. davisi | Several calcaneums, astragali and a navicular.[4] |
Ferae
Ferae reported from the Mission Valley Formation | |||||
---|---|---|---|---|---|
Genus | Species | Presence | Material | Notes | Images |
Ceruttia | C. sandiegoensis | "SDSNH locality 4888, State Road 125 North (Unit II, Mid Brown Siltstone)".[5] | SDSNH 92504 and SDSNH 92503.[5] | A carnivoraform. | |
cf. 'Miacis' | cf. 'M.' hookwayi | SDSNH locality 4715, State Route 125 Grossmont.[5] | SDSNH 84969 "right dentary fragment with p2, m1, and m2".[5] | A miacid. | |
Procynodictis | P. progressus | SDSNH locality 3870, Scripps Ranch North Site 70.[5] | "SDSNH 54413 (left dentary fragment with p2-m2); SDSNH 54414 (right dentary fragment with m1-2); SDSNH 54416 (left maxillary fragment with P4-M1)".[5] | A miacid. |
See also
- Geology of San Diego County, California
- Paleogene Period in California
- List of fossiliferous stratigraphic units in California
- Paleontology in California
References
- ^ a b c d e Kennedy, Michael P. (1975). Geology of the San Diego metropolitan area, California. California Division of Mines and Geology.
- ^ Geiconsultants.com: Geologic Formations of Western San Diego County[permanent dead link], by Jeffrey D. Brown, R.G., C.E.G. − circa 1996.
- ^ Various Contributors to the Paleobiology Database. "Fossilworks: Gateway to the Paleobiology Database". Retrieved 17 December 2021.
- ^ PENKROT, TONYA A.; ZACK, SHAWN P. (2016). "TARSALS OF SESPEDECTINAE (?LIPOTYPHLA) FROM THE MIDDLE EOCENE OF SOUTHERN CALIFORNIA, AND THE AFFINITIES OF EOCENE 'ERINACEOMORPHS'". Journal of Vertebrate Paleontology. 36 (6): 1–17. ISSN 0272-4634.
- ^ a b c d e f Tomiya, Susumu (2013-05-20). "New carnivoraforms (Mammalia) from the middle Eocene of California, USA, and comments on the taxonomic status of 'Miacis' gracilis". Palaeontologia Electronica. 16 (2): 1–14. doi:10.26879/364. ISSN 1094-8074.
Further reading
- "General Plan Final Program EIR: 3.11 Paleontological Resources" (PDF). City of San Diego.
- All articles with dead external links
- Articles with dead external links from April 2020
- Articles with permanently dead external links
- Paleogene California
- Geology of San Diego County, California
- Sandstone formations of the United States
- Geography of San Diego
- Mission Valley, San Diego
- Geologic formations of California
- All stub articles
- California geologic formation stubs
- Paleogene stubs