Alcatraz Island (Cretaceous of the United States)

Where: San Francisco County, California (37.8° N, 122.4° W: paleocoordinates 36.6° N, 70.7° W)

• coordinate estimated from map

• outcrop-level geographic resolution

When: Early/Lower Cretaceous (145.0 - 100.5 Ma)

• "Probably Paskenta group"

• bed-level stratigraphic resolution

Environment/lithology: marine; lithified, coarse-grained, ferruginous sandstone

• [Stewart 1930] "coarse iron-stained sandstone"

Size class: macrofossils

Preservation: mold/impression

Collected by W. M. Gabb; reposited in the CAS

• [Stewart 1930] "Although discovered by "Major George H. Elliot," Gabb claimed to have collected specimens from Alcatraz Island himself."

Primary reference: F. M. Anderson. 1938. Lower Cretaceous deposits in California and Oregon. Geological Society of America Special Paper 16:1-331 [M. Clapham/M. Clapham]more details

Purpose of describing collection: general faunal/floral analysis

PaleoDB collection 216130: authorized by Jonathan Marcot, entered by Jonathan Marcot on 07.12.2020

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Bivalvia
 Lucinida - Lucinidae
Lucina alcatrazis n. sp.
Lucina alcatrazis n. sp. Anderson 1938 clam
 Myalinida - Inoceramidae
"Inoceramus elliottii n. sp." = Inoceramus elliotti
"Inoceramus elliottii n. sp." = Inoceramus elliotti Gabb 1869 clam