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, California.[1][2]

## Contents

* 1 Geology
* 2 Fossil content
* 2.1 Mammals
* 2.1.1 Eulipotyphlans
* 2.1.2 Ferae
* 2.1.3 Primatomorphs
* 3 See also
* 4 References
* 5 Further reading

## 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.  |

#### Primatomorphs

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.  |

## See also

* Geology of San Diego County, California
* Paleogene Period in California
* List of fossiliferous stratigraphic units in California
* Paleontology in California

## References

1. ↑ 1.0 1.1 1.2 1.3 1.4 Kennedy, Michael P. (1975). Geology of the San Diego metropolitan area, California. California Division of Mines and Geology. https://archive.org/details/geologyofsandieg00kennrich.
2. ↑ Geiconsultants.com: Geologic Formations of Western San Diego County , by Jeffrey D. Brown, R.G., C.E.G. − circa 1996.
3. ↑ ((Various Contributors to the Paleobiology Database)). "Fossilworks: Gateway to the Paleobiology Database". https://www.fossilworks.org.
4. ↑ 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). doi:10.1080/02724634.2016.1212059. ISSN 0272-4634. Bibcode: 2016JVPal..36E2059P. https://www.jstor.org/stable/44865966.
5. ↑ 5.0 5.1 5.2 5.3 5.4 5.5 Tomiya, Susumu (2013-05-20). "New carnivoraforms (Mammalia) from the middle Eocene of California, USA, and comments on the taxonomic status of 'Miacis' gracilis" (in English). Palaeontologia Electronica 16 (2): 1–14. doi:10.26879/364. ISSN 1094-8074. https://palaeo-electronica.org/content/2013/435-eocene-carnivoraforms.
6. ↑ 6.00 6.01 6.02 6.03 6.04 6.05 6.06 6.07 6.08 6.09 6.10 6.11 6.12 6.13 6.14 6.15 Lillegraven, Jason A. (1980). "Primates from Later Eocene Rocks of Southern California". Journal of Mammalogy 61 (2): 181–204. doi:10.2307/1380040. ISSN 0022-2372. https://www.jstor.org/stable/1380040.
7. ↑ 7.0 7.1 López-Torres, Sergi; Silcox, Mary T.; Holroyd, Patricia A. (2018-09-22). "New omomyoids (Euprimates, Mammalia) from the late Uintan of southern California, USA, and the question of the extinction of the Paromomyidae (Plesiadapiformes, Primates)" (in English). Palaeontologia Electronica 21 (3): 1–28. doi:10.26879/756. ISSN 1094-8074. https://palaeo-electronica.org/content/2018/2309-new-primate-from-california.

## Further reading

* "General Plan Final Program EIR: 3.11 Paleontological Resources". http://www.sandiego.gov/planning/genplan/pdf/peir/paleontological.pdf.

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