Mountain Pass tracksite, Mescal Range (SBCM): Early Jurassic, California
collected by J. R. Evans 1958
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Chelichnopodidae
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Brasilichnium sp.
Leonardi 1981
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Reynolds 2006 | |||||||||
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Reptilia
- Pterosauria
- Pteraichnidae
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Pteraichnus sp.
Stokes 1957
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Reynolds 2006 | |||||||||
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Reptilia
- Dinosauria
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Dinosauria indet.
Owen 1842
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Reynolds 1989 | |||||||||
| "unnamed broad form", bipedal; abundant | ||||||||||
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Reptilia
- Plateosauridae
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Navahopus sp.
Baird 1980
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Reynolds 2006 | |||||||||
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Reptilia
- Grallatoridae
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Grallator sp.
Hitchcock 1858
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1 specimen | |||||||||
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Anchisauripus sp.
Lull 1904
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6 specimens | |||||||||
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unclassified
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Skolithos sp.
Haldemann 1840
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Reynolds 2006 | |||||||||
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Octopodichnus sp.
Gilmore 1927
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Reynolds 2006 | |||||||||
| see common names | ||||||||||
Geography
| Country: | United States | State/province: | California | County: | San Bernardino |
| Coordinates: | 35.4° North, 115.5° West (view map) | ||||
| Paleocoordinates: | 20.8° North, 53.4° West | ||||
| Basis of coordinate: | stated in text | ||||
| Altitude: | 1576 meters | ||||
| Geographic resolution: | outcrop |
Time
| Period: | Jurassic | Epoch: | Early Jurassic |
| 10 m.y. bin: | Jurassic 1-3 | ||
| Key time interval: | Early Jurassic | ||
| Age range of interval: | 201.4 - 174.7 m.y. ago |
Stratigraphy
| Formation: | Aztec Sandstone |
| Stratigraphic resolution: | bed |
Lithology and environment
| Primary lithology: | current ripples,"cross stratification",yellow lithified cherty/siliceous sandstone |
| Secondary lithology: | coarse,red or brown,white silty sandstone |
| Includes fossils? | Y |
| Lithology description: Aztec Sandstone is made up of two units. The lower resistant sandstone unit (100m thick) is tan to off-white in outcrops but pinkish in fresh exposures. Crosbedded lenses can easily be observed. Frosted and pitted quartz grains well-cemented by silica are described by Evans (1958,1971). The upper and less resistant unit (200m thick) consists of alternating white quartz arenites and red to brown silty sands. | |
| Environment: | dune |
Taphonomy
| Modes of preservation: | trace |
| Size of fossils: | macrofossils |
Collection methods and comments
| Collection excludes: | some macrofossils | ||
| Collection methods: | peel or thin section,observed (not collected) | ||
| Reason for describing collection: | general faunal/floral analysis | ||
| Collectors: | J. R. Evans | Collection dates: | 1958 |
| Taxonomic list comments:Many unnamed and unclassified tracks are listed and partially described but not classified formally. | |||
Metadata
| Database number: | 52175 | ||
| Authorizer: | M. Carrano | Enterer: | K. Maguire, M. Carrano |
| Modifier: | M. Carrano | Research group: | vertebrate |
| Created: | 2005-07-28 14:35:40 | Last modified: | 2018-06-13 15:43:22 |
| Access level: | the public | Released: | 2005-07-28 14:35:40 |
| Creative Commons license: | CC BY |
Reference information
Primary reference:
| 55915. | R. E. Reynolds. 1986. California trackways from the Lower Jurassic Aztec Sandstone. In D. D. Gillette (ed.), First International Symposium on Dinosaur Tracks and Traces. Abstracts with Program 24 [M. Carrano/M. Carrano] |
Secondary references:
| 14021 | ETE | R. E. Reynolds. 1989. Dinosaur trackways in the Lower Jurassic Aztec Sandstone of California. In D. D. Gillette and M. G. Lockley (eds.), Dinosaur Tracks and Traces. Cambridge University Press, Cambridge 285-292 [M. Carrano/K. Maguire/M. Carrano] |
| 43829 | R. E. Reynolds. 1994. Fossils in southern California. Rocks and Minerals 69:386-391 [M. Carrano/M. Carrano] | |
| 65921 | R. E. Reynolds. 2006. Way out west: Jurassic tracks on the continental margin. In J. D. Harris, S. G. Lucas, J. A. Spielmann, M. G. Lockley, A. R. C. Milner, & J. I. Kirkland (eds.), The Triassic-Jurassic Terrestrial Transition. New Mexico Museum of Natural History and Science Bulletin 37:232-237 [M. Carrano/M. Carrano] | |
| 51458 | R. E. Reynolds. 2006. Jurassic tracks in California. In R. E. Reynolds (ed.), Making Tracks Across the Southwest: The 2006 Desert Symposium 19-24 [M. Carrano/M. Carrano] | |
| 65920 | R. E. Reynolds and D. L. Mickelson. 2006. Way out west: preliminary description and comparison of pterosaur ichnites from the Mescal Range, Mojave Desert, California. In J. D. Harris, S. G. Lucas, J. A. Spielmann, M. G. Lockley, A. R. C. Milner, & J. I. Kirkland (eds.), The Triassic-Jurassic Terrestrial Transition. New Mexico Museum of Natural History and Science Bulletin 37:226-231 [M. Carrano/M. Carrano] | |
| 51462 | R. E. Reynolds, D. L. Schmidt, J. D. Harris and A. R. C. Milner. 2006. Making Tracks Across the Southwest—the 2006 Desert Symposium field trip. In R. E. Reynolds (ed.), Making Tracks Across the Southwest: The 2006 Desert Symposium 3-17 [M. Carrano/M. Carrano/M. Carrano] |