USGS MR 5064, Alexander Avenue, Marin Headlands (M-2bT) (Cretaceous to of the United States)

Where: Marin County, California (37.8° N, 122.5° W: paleocoordinates 37.1° N, 81.7° W)

• coordinate estimated from map

• outcrop-level geographic resolution

When: Late/Upper Albian to Late/Upper Albian (105.3 - 93.5 Ma)

• Assemblage MH-7: The probable range of this assemblage is late Albian to early Cenomanian.

• bed-level stratigraphic resolution

Environment/lithology: basinal (siliceous); lithified chert

Size class: macrofossils

Reposited in the USGS

Primary reference: B. Murchey. 1984. Biostratigraphy and lithostratigraphy of chert in the Franciscan complex, Marin Headlands, California. Franciscan Geology of Northern California Field Trip Guidebook 43, Society of Economic Paleontologists and Mineralogists, Pacific Section 51-70 [M. Clapham/M. Clapham]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 185264: authorized by Matthew Clapham, entered by Matthew Clapham on 17.04.2017

Creative Commons license: CC BY (attribution)

Taxonomic list

 Nassellaria - Williriedellidae
Holocryptocanium barbui Dumitrica 1970 radiolarian
 Nassellaria - Archaeodictyomitridae
Dictyomitra "sp. A" Zittel 1876 radiolarian
 Nassellaria - Xitidae
Novixitus "sp. A" Pessagno 1977 radiolarian