Pomerado Conglomerate
| 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
[edit]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
[edit]Color key
|
Notes Uncertain or tentative taxa are in small text; |
The Pomerado Conglomerate preserves fossils dating back to the Late Eocene Epoch of the Paleogene period, during the Cenozoic Era.[3]
Mammals
[edit]Ferae
[edit]| 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
[edit]| 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
[edit]
- Geology of San Diego County, California
- Paleogene Period in California
- List of fossiliferous stratigraphic units in California
- Paleontology in California
References
[edit]- ^ a b c d e Kennedy, Michael P. (1975). Geology of the San Diego metropolitan area, California. California Division of Mines and Geology.
- ^ Geiconsultants.com: Geologic Formations of Western San Diego County[permanent 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". Retrieved 17 December 2021.
- ^ a b Tomiya, Susumu (2013-05-20). "New carnivoraforms (Mammalia) from the middle Eocene of California, USA, and comments on the taxonomic status of 'Miacis' gracilis". Palaeontologia Electronica. 16 (2): 1–14. doi:10.26879/364. ISSN 1094-8074.
- ^ a b c d 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. hdl:2433/276689. PMC 9554728. S2CID 252818430.
- ^ a b c Walsh, Stephen L. (September 2010). "New myomorph rodents from the Eocene of Southern California". Journal of Vertebrate Paleontology. 30 (5): 1610–1621. Bibcode:2010JVPal..30.1610W. doi:10.1080/02724634.2010.501433. S2CID 129569996.
Further reading
[edit]- "General Plan Final Program EIR: 3.11 Paleontological Resources" (PDF). City of San Diego.
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