| 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]
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]
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]
| Eulipotyphlans reported from the Mission Valley Formation | |||||
|---|---|---|---|---|---|
| Genus | Species | Presence | Material | Notes | Images |
| Proterixoides | P. davisi | Several calcaneums, astragali and a navicular. [4] | |||
| 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. | |
| Primatomorphs reported from the Mission Valley Formation | |||||
|---|---|---|---|---|---|
| Genus | Species | Presence | Material | Notes | Images |
| Hemiacodon | H. sp. | V-72157. [6] | Isolated fragmentary teeth. [6] | An omomyid, most similar to H. gracilis. | |
| ?Macrotarsius | ?M. sp. | V-72150 & V-73138. [6] | Isolated molars. [6] | An omomyid also known from the Friars Formation, closely similar to M. jepseni. | |
| Microsyops | M. sp. cf. M. annectens | V-72158. [6] | Isolated & fragmentary molar (UCMP 101619). [6] | A microsyopid. | |
| Notharctus | N. sp. | V-72157. [6] | Damaged isolated molar (UCMP 113256). [6] | A notharctine similar to N. robustior. | |
| Omomys | O. powayensis | V-71180, V-72157 & V-72158. [6] | Teeth. [6] | An omomyid also known from the Friars Formation. | |
| Pelycodus | P. sp. | V-73138. [6] | Maxillary fragment (UCMP 113210). [6] | A notharctine. | |
| Uintasorex | U. montezumicus | V-71180, V-71211, V-72157, V-72158, V-72176, V-72177, V-72179, V-73138 & V-73139. [6] | Isolated teeth. [6] | A microsyopid also known from the Friars Formation. | |
| Walshina | W. esmaraldensis | SDSNH localities 3426 and 4020. [7] | Teeth. [7] | An omomyid also known from the Sespe & Santiago formations. | |
| Washakius | W. woodringi | V-71211, V-72157, V-72158, V-72176, V-72179 & V-73138. [6] | Teeth & jaw elements. [6] | An omomyid also known from the Friars Formation. | |
Adapiformes is a group of early primates. Adapiforms radiated throughout much of the northern continental mass, reaching as far south as northern Africa and tropical Asia. They existed from the Eocene to the Miocene epoch. Some adapiforms resembled living lemurs.
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The Pomerado Conglomerate Formation is a geologic formation in southwestern San Diego County, California.
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