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. |
Original source: https://en.wikipedia.org/wiki/Mission Valley Formation.
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