Spring Canyon: Duchesnean, California
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Mammalia
- Rodentia
- Ischyromyidae
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Ischyromys sp.
Leidy 1856
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Walsh and Gutzler 1999 | |||||||||
Mammalia
- Rodentia
- Heliscomyidae
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Heliscomys sp.
Cope 1873
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Walsh and Gutzler 1999 | |||||||||
Mammalia
- Rodentia
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cf. Griphomys sp.
Wilson 1940
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Walsh and Gutzler 1999 | |||||||||
said to be new | ||||||||||
Mammalia
- Rodentia
- Eomyidae
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cf. Metanoiamys sp.
Chiment and Korth 1996
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Walsh and Gutzler 1999 | |||||||||
Protadjidaumo sp.
Burke 1934
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Walsh and Gutzler 1999 | |||||||||
cf. Paradjidaumo sp.
Burke 1934
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Walsh and Gutzler 1999 | |||||||||
Mammalia
- Rodentia
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Diplolophus sp.
Troxell 1923
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Walsh and Gutzler 1999 | |||||||||
said to be new | ||||||||||
= Nonomyinae indet.
Martin 1980
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Walsh 2010 | |||||||||
said to be new: from SDSNH 4042 | ||||||||||
Nonomys sp.
Emry and Dawson 1973
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Walsh and Gutzler 1999 | |||||||||
said to be new (33 measurements) | ||||||||||
= Nonomys gutzleri n. sp.
Walsh 2010
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Walsh 2010 | |||||||||
type is from SDSNH Locality 4041; also present at 4042 | ||||||||||
Mammalia
- Primates
- Microsyopidae
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Uintasoricinae indet.
Szalay 1969
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Walsh and Gutzler 1999 | |||||||||
Mammalia
- Geolabididae
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Centetodon cf. magnus
(Clark 1936)
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Walsh and Gutzler 1999 | |||||||||
Mammalia
- Perissodactyla
- Equidae
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Mesohippus sp.
Marsh 1875
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Walsh and Gutzler 1999 | |||||||||
Mammalia
- Camelidae
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Camelidae indet.
Gray 1821
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Walsh and Gutzler 1999 | |||||||||
Mammalia
- Agriochoeridae
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? Agriochoeridae indet.
Leidy 1869
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Walsh and Gutzler 1999 | |||||||||
Mammalia
- Hypertragulidae
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cf. Hypertragulus sp.
Cope 1874
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Walsh and Gutzler 1999 | |||||||||
Mammalia
- Carnivora
- Nimravidae
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cf. Hyaenodon sp.
Laizer and Parieu 1838
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Walsh and Gutzler 1999 | |||||||||
= Pangurban egiae n. gen., n. sp.
Poust et al. 2022
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Poust et al. 2022 | |||||||||
SDSNH 60554 at SDSNH loc. 4042 | ||||||||||
Mammalia
- Carnivora
- Mustelidae
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Mustelidae indet.
Fischer 1817
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Walsh and Gutzler 1999 | |||||||||
Mammalia
- Groeberida
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Herpetotherium valens
(Lambe 1908)
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Walsh and Gutzler 1999 | |||||||||
Mammalia
- Groeberida
- Nototheriidae
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Peradectes sp.
Matthew and Granger 1921
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Walsh and Gutzler 1999 | |||||||||
see common names |
Geography
Country: | United States | State/province: | California | County: | San Diego |
Coordinates: | 32.9° North, 117.0° West (view map) | ||||
Paleocoordinates: | 32.3° North, 105.3° West | ||||
Basis of coordinate: | based on nearby landmark | ||||
Altitude: | 290 meters | ||||
Geographic resolution: | outcrop |
Time
Period: | Paleogene | Epoch: | Eocene |
Stage: | Bartonian | 10 m.y. bin: | Cenozoic 3 |
*Period: | Tertiary | *Local age/stage: | Late/Upper Duchesnean - Early/Lower Chadronian |
Key time interval: | Duchesnean | ||
Age range of interval: | 40.40000 - 37.20000 m.y. ago | ||
* legacy (obsolete) database fields |
Stratigraphy
Formation: | Pomerado | ||||
Stratigraphic resolution: | bed | ||||
Stratigraphy comments: said to be late Duchesnean to early Chadronian "about 10 m above the base of the upper member" (Walsh 2010); age refined in Poust et al. to middle to late Duchesnean based on interpretation of upper part of Pomerado Conglomerate as falling within Chron 17n |
Lithology and environment
Primary lithology: | gray,green silty mudstone |
Lithology description: "Locality 4041 consists of a single large rip-up clast of purplish and greenish mudstone occurring within a pale gray cobble conglomerate... almost certaintly derived from an immediately underlying, laterally extensive bed of pale greenish gray siltstone and mudstone up to 1 m thick, from which Locality 4042 was collected" (Walsh 2010) | |
Environment: | terrestrial indet. |
Taphonomy
Modes of preservation: | body |
Size of fossils: | mesofossils |
Collection methods and comments
Collection methods: | bulk,chemical,sieve |
Minimum sieve size: | 0.600 |
Rock censused: | 4160 kg |
Reason for describing collection: | general faunal/floral analysis |
Collection method comments: SDSNH collection
"Approximately 360 kg of matrix from [4041] and ~3800 kg of matrix from [4042] were screenwashed using 30-mesh screens (0.6 mm square openings)... concentrates were processed... using the heavy liquid tetrabromoethane" |
Metadata
Also known as: | SDSNH 4041, 4042; Upper Pomerado Conglomerate | ||
Database number: | 17039 | ||
Authorizer: | J. Alroy, P. Holroyd | Enterer: | J. Alroy, P. Holroyd |
Modifier: | J. Marcot | Research group: | vertebrate |
Created: | 1999-09-21 00:00:00 | Last modified: | 2024-03-06 15:15:42 |
Access level: | the public | Released: | 1999-09-21 00:00:00 |
Creative Commons license: | CC BY |
Reference information
Primary reference:
82855. | A. W. Poust, P. Z. Barrett, and S. Tomiya. 2022. An early nimravid from California and the rise of hypercarnivorous mammals after the middle Eocene climatic optimum. Biology Letters 18(20220291):1-6 [P. Holroyd/P. Holroyd] |
Secondary references:
34056 | S. L. Walsh. 2010. New myomorph rodents from the Eocene of Southern California. Journal of Vertebrate Paleontology 30(5):1610-1621 [J. Alroy/J. Alroy] | |
3545 | S. L. Walsh and R. Q. Gutzler. 1999. A new Mio-Pliocene marine bone-bed from north-central Chile. Journal of Vertebrate Paleontology 19(3):82A-83A [J. Alroy/J. Alroy/M. Uhen] |