Earth:Pomerado Conglomerate
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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]
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
- ↑ 1.0 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.
- ↑ 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.
- ↑ ((Various Contributors to the Paleobiology Database)). "Fossilworks: Gateway to the Paleobiology Database". http://www.fossilworks.org/cgi-bin/bridge.pl?action=home.
- ↑ 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.
- ↑ 5.0 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.
- ↑ 6.0 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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