USGS Mesozoic M8554, Loma Chiquita road (Cretaceous of the United States)

Where: Santa Clara County, California (37.1° N, 121.8° W: paleocoordinates 43.3° N, 91.5° W)

• coordinate stated in text

• outcrop-level geographic resolution

When: Late/Upper Campanian (83.5 - 70.6 Ma)

• Age is poorly constrained but indicative of Late Campanian. Taxa have type locality near at Texas Flat, near Folsom, which belongs to Upper Campanian based on Baculites inornatus and B. occidentalis. Spondylus subnodosus has its type locality in the Santa Ana Mountains in Upper Campanian Metaplacenticeras pacificum zone. Baculitids found are only known from Late Campanian.

• group of beds-level stratigraphic resolution

Environment/lithology: marine; lithified siliciclastic sediments

Size class: macrofossils

Collected by W.P. Elder; reposited in the USNM

Primary reference: W. P. Elder. 1991. An unusual Late Cretaceous fauna from an oyster-rich interval in the Santa Cruz Mountains of California. United States Geological Survey Bulletin 1934:E1-E18 [M. Clapham/M. Clapham/M. Clapham]more details

Purpose of describing collection: general faunal/floral analysis

PaleoDB collection 167703: authorized by Matthew Clapham, entered by Matthew Clapham on 29.03.2015

Creative Commons license: CC BY (attribution)

Taxonomic list

Bivalvia
 Nuculida - Nuculidae
Acila (Truncacila) demessa Finlay 1927 divaricate nutclam
 Lucinida - Mactromyidae
Clisocolus cf. cordatus Whiteaves 1879 clam
 Arcida - Parallelodontidae
"? Indogrammatodon sp." = Grammatodon (Indogrammatodon)
"? Indogrammatodon sp." = Grammatodon (Indogrammatodon) Cox 1937 clam
 Ostreida - Ostreidae
Ostrea sp. Linnaeus 1758 oyster
 Myalinida - Inoceramidae
Gastropoda
 Neogastropoda - Perissityidae
Perissitys sp. Stewart 1927 snail
 Caenogastropoda - Fasciolariidae
? Gyrodes sp. Conrad 1860 moon snail
 Heterostropha - Ringiculidae
Biplica obliqua Gabb 1864 snail
Cephalopoda
 Ammonitida - Baculitidae
Baculites rex Anderson 1958 ammonite
 Ammonitida - Tetragonitidae
Gaudryceras ? tenuiliratum Yabe 1903 ammonite