| Mission Valley Formation | |
| Type: | Geologic formation |
| Age: | Paleogene |
| Period: | Paleogene |
| Prilithology: | sandstone |
| Namedfor: | Mission Valley, San Diego |
| Region: | San Diego County, California |
| Country: | United States |
| Underlies: | Pomerado Conglomerate |
| Overlies: | Stadium Conglomerate |
| Thickness: | 0m-60mm (00feet-200feetm) |
The Mission Valley Formation is a marine sandstone geologic formation in the Mission Valley region of southwestern San Diego County, 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 0m-60mm (00feet-200feetm).[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]
| 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. | A carnivoraform. | |
| cf. ' | cf. | SDSNH locality 4715, State Route 125 Grossmont. | SDSNH 84969 "right dentary fragment with p2, m1, and m2". | A miacid. | |
| Procynodictis | P. progressus | SDSNH locality 3870, Scripps Ranch North Site 70. | "SDSNH 54413 (left dentary fragment with p2-m2); SDSNH 54414 (right dentary fragment with m1-2); SDSNH 54416 (left maxillary fragment with P4-M1)". | A miacid. | |
| Primatomorphs reported from the Mission Valley Formation | ||||||
|---|---|---|---|---|---|---|
| Genus | Species | Presence | Material | Notes | Images | |
| Hemiacodon | H. sp. | V-72157.[6] | Isolated fragmentary teeth. | An omomyid, most similar to H. gracilis. | ||
| ?Macrotarsius | ?M. sp. | V-72150 & V-73138. | Isolated molars. | An omomyid also known from the Friars Formation, closely similar to M. jepseni. | ||
| Microsyops | M. sp. cf. M. annectens | V-72158. | Isolated & fragmentary molar (UCMP 101619). | A microsyopid. | ||
| Notharctus | N. sp. | V-72157. | Damaged isolated molar (UCMP 113256). | A notharctine similar to N. robustior. | ||
| Omomys | O. powayensis | V-71180, V-72157 & V-72158. | Teeth. | An omomyid also known from the Friars Formation. | ||
| Pelycodus | P. sp. | V-73138. | Maxillary fragment (UCMP 113210). | A notharctine. | ||
| Uintasorex | U. montezumicus | V-71180, V-71211, V-72157, V-72158, V-72176, V-72177, V-72179, V-73138 & V-73139. | Isolated teeth. | A microsyopid also known from the Friars Formation. | ||
| Walshina | W. esmaraldensis | SDSNH localities 3426 and 4020.[7] | Teeth. | An omomyid also known from the Sespe & Santiago formations. | ||
| Washakius | W. woodringi | V-71211, V-72157, V-72158, V-72176, V-72179 & V-73138. | Teeth & jaw elements. | An omomyid also known from the Friars Formation. | ||