UCLA loc. 3466: Early Cenomanian, California
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Cephalopoda
- Ammonitida
- Baculitidae
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Sciponoceras sp.
Hyatt 1894
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u category | |||||||||
| originally entered as "Scipionoceras sp." | ||||||||||
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Gastropoda
- Aporrhaidae
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Arrhoges californicus
(Gabb 1864)
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u category | |||||||||
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Gastropoda
- Neogastropoda
- Fasciolariidae
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Paleopsephaea sacramentica
Murphy and Rodda 1960
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u category | |||||||||
| see common names | ||||||||||
Geography
| Country: | United States | State/province: | California | County: | Shasta |
| Coordinates: | 40.5° North, 122.6° West (view map) | ||||
| Paleocoordinates: | 41.6° North, 82.7° West | ||||
| Basis of coordinate: | estimated from map | ||||
| Geographic resolution: | small collection |
Time
| Period: | Cretaceous | Epoch: | Late Cretaceous |
| Stage: | Cenomanian | 10 m.y. bin: | Cretaceous 5 |
| *International age/stage: | Albian - Cenomanian | ||
| Key time interval: | Early Cenomanian | ||
| Age range of interval: | 100.5 - 93.9 m.y. ago | ||
| * legacy (obsolete) database fields | |||
Stratigraphy
| Formation: | Budden Canyon | Member: | Bald Hills | ||
| Stratigraphic resolution: | bed | ||||
| Stratigraphy comments: "The Bald Hills Fm. ranges in age from upper Albian through Cenomanian and possibly into the lower Turonian." JA: the Bald Hills is actually a member of the Budden Canyon Formation and Lower Cenomanian according to Murphy and Rodda 1996 | |||||
Lithology and environment
| Primary lithology: | lithified sandstone |
| Environment: | marine indet. |
| Geology comments: (The samples from this locality come from a ~400-500' higher conglomerate than the basal one, according to the strat column). Congl. grain size from fine sand to boulders, avg. 2" diam. Well rounded; matrix med- to coarse-grained graywacke or very sandy mudstone. Majority of cobbles are dark porphyritic volcanics, remainder include metamorphic and granitic rocks, chert, mudstone and limestone. Congl. are sometimes fairly well bedded, esp. near tops, where they almost always grade upward to massive, then finely bedded sandstones. | |
Taphonomy
| Modes of preservation: | body |
| Size of fossils: | macrofossils |
Collection methods and comments
| Collection methods: | mechanical,field collection |
| Reason for describing collection: | taxonomic analysis |
| Taxonomic list comments:Abundances: R= rare (1-2), U= uncommon (3-10), A= abundant (>10). Authors very unclear as to whether specimens are found in matrix of the conglomerate or within clasts. "Some of the species found in the nodules and other reworked sedimentary rocks were extant at the time this conglomerate unit was deposited." They also list Cucullaea truncata (Gabb) as "...occurs below, above and in the matrix of the conglomerate as well as in the clasts of the conglomerate," then they do not list it in the species list. | |
Metadata
| Also known as: | LACMIP loc. 23466 | ||
| Database number: | 1796 | ||
| Authorizer: | J. Alroy | Enterer: | M. Sommers |
| Modifier: | J. Marcot | Research group: | marine invertebrate |
| Created: | 1999-06-08 16:46:15 | Last modified: | 2020-12-09 19:51:02 |
| Access level: | the public | Released: | 1999-06-08 16:46:15 |
| Creative Commons license: | CC BY | ||
Reference information
Primary reference:
| 48. | M. A. Murphy and P. U. Rodda. 1960. Mollusca of the Cretaceous Bald Hills Formation of California. Journal of Paleontology 34(5):835-858 [J. Alroy/M. Sommers/J. Alroy] |