CAS Loc. 27838, Chico Creek: Early/Lower Campanian, California
collected by H.A. Taff, G.D. Hanna, C.M.Cross 1934

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Cephalopoda - Ammonitida - Diplomoceratidae
Oxybeloceras taffi n. sp. Anderson 1958
Anderson 1958
synonym of Pseudoxybeloceras lineatum
Cephalopoda - Ammonitida - Baculitidae
Baculites buttensis Anderson 1958
Anderson 1958
synonym of Baculites capensis
Baculites chicoensis Trask 1856
Cephalopoda - Ammonitida - Pachydiscidae
Parapachydiscus aff. gabbi Anderson 1958
Anderson 1958
synonym of Pachydiscus buckhami
Parapachydiscus bidwelli n. sp. Anderson 1958
Anderson 1958
synonym of Pachydiscus neevesi
(1 measurement)
Canadoceras fraternum (Gabb 1869)
Anderson 1958
Cephalopoda - Ammonitida - Desmoceratidae
Hauericeras mickeyi Anderson 1958
Anderson 1958
synonym of Hauericeras (Gardeniceras) angustum
(1 measurement)
Cephalopoda - Ammonitida - Collignoniceratidae
Ammonites chicoensis Trask 1856
recombined as Submortoniceras chicoense
Mortoniceras (Submortoniceras) randalli Anderson 1958
Anderson 1958
synonym of Submortoniceras chicoense
(1 measurement)
Mortoniceras (Submortoniceras) gabbi (Anderson 1902)
Anderson 1958
synonym of Submortoniceras chicoense
Mortoniceras buttense (Anderson 1902)
Anderson 1958
synonym of Submortoniceras chicoense
Mortoniceras (Submortoniceras) pentzanum n. sp. Anderson 1958
Anderson 1958
synonym of Submortoniceras chicoense
(1 measurement)
Butticeras studleyi n. sp. Anderson 1958
Anderson 1958
recombined as Submortoniceras studleyi
(1 measurement)
Gastropoda - Heterostropha - Ringiculidae
Oligoptycha obliqua (Gabb 1864)
recombined as Biplica obliqua
Gastropoda - Neogastropoda - Perissityidae
Perissitys brevirostris (Gabb 1864)
Anderson 1958
Gastropoda - Neogastropoda - Volutidae
Volutoderma averillii (Gabb 1864)
Anderson 1958
Volutoderma californica Dall 1907
Anderson 1958
synonym of Volutoderma averillii
Gastropoda - Aporrhaidae
Anchura falciformis (Gabb 1864)
    = Anchura callosa Whiteaves 1903
Elder and Saul 1996
Bivalvia - Nuculida - Nuculidae
Acila (Truncacila) demessa (Finlay 1927)
Anderson 1958
Bivalvia - Myalinida - Inoceramidae
Inoceramus sp. Sowerby 1814
Anderson 1958
Inoceramus chicoensis n. sp. Anderson 1958
Anderson 1958
Bivalvia - Arcida - Cucullaeidae
Cucullaea aff. youngi Waring 1917
Anderson 1958
recombined as Cucullaea (Idonearca) youngi
Bivalvia - Cardiida - Veneridae
Trigonocallista varians (Gabb 1864)
    = Trigonocallista buttensis n. sp. Anderson 1958
Anderson 1958
recombined as Calva (Egelicalva) buttensis
Trigonocallista bowersiana (Cooper 1894)
Anderson 1958
recombined as Calva (Egelicalva) bowersiana
Bivalvia - Cardiida - Arcticidae
Tenea inflata (Gabb 1864)
Bivalvia - Trigoniida - Steinmanellidae
Trigonia hemphilli Anderson 1958
Anderson 1958
recombined as Popenoella hemphilli
see common names

Geography
Country:United States State/province:California County:Butte
Coordinates: 39.8° North, 121.7° West (view map)
Paleocoordinates:47.1° North, 90.3° West
Basis of coordinate:estimated from map
Geographic resolution:outcrop
Time
Period:Cretaceous Epoch:Late/Upper Cretaceous
Stage:Campanian 10 m.y. bin:Cretaceous 7
Key time interval:Early/Lower Campanian
Age range of interval:83.60000 - 72.10000 m.y. ago
Stratigraphy
Geological group:Asuncion Formation:Chico Member:Tenmile
Stratigraphic resolution:bed
Stratigraphy comments: Middle of the exposed section, 1225 ft above its base. The complete thickness of the Chico Formation is not exposed anywhere, since its upper beds are overlain by the volcanic Tusacan Formation. The greatest thickness of the Chico exposed in the region is in Big Chico Creek, where it reaches about 2000 ft.
Lithology and environment
Primary lithology: lithified sandstone
Includes fossils?Y
Lithology description: Bedded sandstone.
Environment:marine indet.
Geology comments: No paleoenvironmental data reported.
Taphonomy
Modes of preservation:body
Size of fossils:macrofossils
Collection methods and comments
Collection methods:selective quarrying,field collection
Reason for describing collection:taxonomic analysis
Museum repositories:CAS
Collectors:H.A. Taff, G.D. Hanna, C.M.Cross Collection dates:1934
Metadata
Database number:44277
Authorizer:A. Hendy, J. Marcot, M. Clapham Enterer:A. Hendy, M. Clapham, J. Marcot
Modifier:J. Marcot Research group:marine invertebrate
Created:2004-09-08 00:47:15 Last modified:2020-11-10 15:04:03
Access level:the public Released:2004-09-08 00:47:15
Creative Commons license:CC BY
Reference information

Primary reference:
74314. J. A. Taff, G. D. Hanna, and C. M. Cross. 1940. Type locality of the Cretaceous Chico formation. Geological Society America Bulletin 51(9):1131-1328 [J. Marcot/J. Marcot]

Secondary references:

11610 F. M. Anderson. 1958. Upper Cretaceous of the Pacific Coast. Geological Society of America Memoir 71:1-378 [A. Miller/A. Hendy/M. Clapham]
261 W. P. Elder and L. R. Saul. 1996. Taxonomy and biostratigraphy of Coniacian through Maastrichtian Anchura (Gastropoda; Aporrhaiidae) of the North American Pacific slope. Journal of Paleontology 70(3):381-399 [M. Patzkowsky/K. Layou/M. Clapham]