UCLA loc. 3777, North Fork Cottonwood Creek: Early/Lower Cenomanian, California
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Cephalopoda
- Ammonitida
- Desmoceratidae
|
||||||||||
Desmoceras cf. argonauticum
(Anderson 1958)
|
r category | |||||||||
(Pseudouhligella) - originally entered as "Desmoceras cf. argonauticum" | ||||||||||
= Desmoceras (Pseudouhligella) argonauticum
Anderson 1958
|
Keupp 2008 | |||||||||
Cephalopoda
- Ammonitida
- Brancoceratidae
|
||||||||||
Mortoniceras gainesana
(Anderson 1958)
|
r category | |||||||||
Gastropoda
- Heterostropha
- Ringiculidae
|
||||||||||
Biplica isoplicata
Popenoe 1957
|
||||||||||
quest. ident. | ||||||||||
Gastropoda
- Turritellidae
|
||||||||||
Turritella cf. robertiana
(Anderson 1958)
|
||||||||||
quest. ident. - originally entered as "Turritella cf. robertiana" | ||||||||||
= Turritella xylina
Squires and Saul 2006
|
Squires and Saul 2005 | |||||||||
Gastropoda
- Ampullinidae
|
||||||||||
Ampullina stantoni
Murphy and Rodda 1960
|
||||||||||
quest. ident. - originally entered as "Ampulina stantoni" | ||||||||||
Gastropoda
- Aporrhaidae
|
||||||||||
Arrhoges californicus
(Gabb 1864)
|
||||||||||
recombined as Latiala californica | ||||||||||
quest. ident. | ||||||||||
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: | based on political unit | ||||
Geographic resolution: | small collection |
Time
Period: | Cretaceous | Epoch: | Late/Upper Cretaceous |
Stage: | Cenomanian | 10 m.y. bin: | Cretaceous 5 |
*International age/stage: | Albian - Cenomanian | ||
Key time interval: | Early/Lower Cenomanian | ||
Age range of interval: | 100.50000 - 93.90000 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 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 conglomerate |
Environment: | marine indet. |
Geology comments: Congl. grain size from find 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. 23777 | ||
Database number: | 1787 | ||
Authorizer: | J. Alroy, J. Marcot, P. Wagner | Enterer: | M. Sommers, P. Wagner, J. Marcot |
Modifier: | J. Marcot | Research group: | marine invertebrate |
Created: | 1999-06-08 14:39:03 | Last modified: | 2021-09-11 12:32:38 |
Access level: | the public | Released: | 1999-06-08 14:39:03 |
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] |
Secondary references:
72376 | H. Keupp. 2008. Desmoceras (Pseudouhligella) intrapunctatum n. sp. (Ammonoidea) aus dem Unter-Albium von NW-Madagaskar mit Ritzstreifen. Paläontologische Zeitschrift 82(4):437-447 [P. Wagner/P. Wagner] | |
19980 | R. L. Squires and L. R. Saul. 2005. New Late Cretaceous (Santonian and Campanian) gastropods from California and Baja California, Mexico. The Nautilus 119(4):133-148 [A. Hendy/A. Hendy] |