USGS Mesozoic M5890, Mount Madonna road (Cretaceous of the United States)

Also known as 71-LP-597

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 T. Simoni in 1971; 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 167706: authorized by Matthew Clapham, entered by Matthew Clapham on 29.03.2015

Creative Commons license: CC BY (attribution)

Taxonomic list

Gastropoda
 Epitonioidea - Epitoniidae
"Opalia (Confusiscala) sp." = Confusiscala
"Opalia (Confusiscala) sp." = Confusiscala de Boury 1909 wentletrap
 Sorbeoconcha - Naticidae
? Gyrodes sp. Conrad 1860 moon snail
Bivalvia
 Lucinida - Mactromyidae
Clisocolus cf. cordatus Whiteaves 1879 clam
 Trigoniida - Megatrigonioidae
Pterotrigonia evansana Meek 1864 clam
 Arcida - Glycymerididae