UCLA loc. 3767: Early/Lower Cenomanian, California

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Bivalvia - Arcida - Glycymerididae
Glycymeris pacifica (Anderson 1902)
Squires 2010
Gastropoda - Heterostropha - Acteonidae
Tornatellaea aff. impressa (Gabb 1864)
r category
originally entered as "Tornatellaea aff. impressa"
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 - Neogastropoda - Buccinidae
Cantharus occidentalis (Gabb 1869)
r category
Gastropoda - Neogastropoda - Fasciolariidae
Paleopsephaea sacramentica Murphy and Rodda 1960
u category
Gastropoda - Aporrhaidae
Arrhoges californicus (Gabb 1864)
a category
recombined as Latiala californica
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/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 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 thin-bedded graywacke 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. 23767
Database number:1799
Authorizer:J. Alroy, J. Marcot Enterer:M. Sommers, J. Marcot
Modifier:J. Marcot Research group:marine invertebrate
Created:1999-06-08 17:05:07 Last modified:2020-12-09 19:49:26
Access level:the public Released:1999-06-08 17:05:07
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:

59062 R. L. Squires. 2010. Northeast Pacific Upper Cretaceous and Paleocene Glycymeridid Bivalves. Journal of Paleontology 84(5):895-917 [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]