Pomerado Conglomerate

Short description: Geologic formation

Pomerado Conglomerate Formation
Stratigraphic range: Late Eocene

Type| Geologic formation
Overlies| Mission Valley Formation
Thickness| 0–55 metres (0–180 ft)
Lithology
Primary| conglomerate
Location
Region| San Diego County, California
Country|  United States
Type section
Named for| Pomerado Road

The Pomerado Conglomerate Formation is a geologic formation in southwestern San Diego County, California.[1][2]

It was named for exposures located along Pomerado Road, at the divide between Carroll Canyon and Poway Valley.[1]

## Contents

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

## Geology

The Pomerado Conglomerate is of the Late Eocene Epoch, and is a massive cobble conglomerate. It is lithologically identical to the local Stadium Conglomerate.[1]

It overlies the sandstone Mission Valley Formation.[1] It is the uppermost formation of the Poway Group, and has a maximum thickness of 55 metres (180 ft).[1]

## Fossil content

The Pomerado Conglomerate preserves fossils dating back to the Late Eocene Epoch of the Paleogene period, during the Cenozoic Era.[3]

### Mammals

#### Ferae

Ferae reported from the Pomerado Conglomerate

Genus | Species | Presence  | Material | Notes | Images
Carnivoraformes undet. Genus B  |  | SDSNH locality 3757, Scripps Ranch North Site 57, Miramar Sandstone Member.[4] | SDSNH 56335, cranium with right and left P4-M2.[4] |  |
Hyaenodon | cf. H. sp.  | Upper Member.[5] | "SDSNH 60554, right maxillary fragment with P3–P4".[5] | Specimen reidentified as the nimravid Pangurban.  |
Pangurban | P. egiae | Upper Member.[5] | "SDSNH 60554, right maxillary fragment with P3–P4".[5] | A nimravid, originally reported as cf. Hyaenodon sp.  |

#### Rodents

Rodents reported from the Pomerado Conglomerate

Genus | Species | Presence  | Material | Notes | Images
Nonomyinae  | Indeterminate  |  | Isolated m1 (SDSNH 72232).[6] | "An unnamed new taxon of nonomyine morphologically intermediate between Nonomys and Diplolophus."[6] |
Nonomys | N. gutzleri |  | Isolated teeth.[6] | A myomorph.  |

## 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[yes|permanent dead link|dead link}}], by Jeffrey D. Brown, R.G., C.E.G. − circa 1996.
3. ↑ ((Various Contributors to the Paleobiology Database)). "Fossilworks: Gateway to the Paleobiology Database". http://www.fossilworks.org/cgi-bin/bridge.pl?action=home.
4. ↑ 4.0 4.1 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.
5. ↑ 5.0 5.1 5.2 5.3 Poust, Ashley W.; Barrett, Paul Z.; Tomiya, Susumu (2022). "An early nimravid from California and the rise of hypercarnivorous mammals after the middle Eocene climatic optimum". Biology Letters 18 (10): 20220291. doi:10.1098/rsbl.2022.0291. https://royalsocietypublishing.org/doi/10.1098/rsbl.2022.0291.
6. ↑ 6.0 6.1 6.2 Walsh, Stephen L. (September 2010). "New myomorph rodents from the Eocene of Southern California". Journal of Vertebrate Paleontology 30 (5): 1610–1621. doi:10.1080/02724634.2010.501433. https://www.tandfonline.com/doi/abs/10.1080/02724634.2010.501433?cookieSet=1.

## 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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