Where: Marin County, California (37.8° N, 122.5° W: paleocoordinates 31.9° N, 62.4° W)
• coordinate estimated from map
• outcrop-level geographic resolution
When: Bathonian to Bathonian (168.3 - 161.2 Ma)
• Assemblage MH-4: upper Middle Jurassic (Bathonian and (or) Callovian) and (or) lower Upper Jurassic (Oxfordian?, Kimmeridgian?). Bathonian to Early Callovian in Kohnen & Murchey, 1995.
• 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 185259: authorized by Matthew Clapham, entered by Matthew Clapham on 17.04.2017
Creative Commons license: CC BY (attribution)
Taxonomic list
Protozoa | |
Ristola turpicula Pessagno and Whalen 1982 radiolarian | |
Napora "sp. D" Pessagno 1977 radiolarian | |
Hsuum "sp. C" Pessagno 1977 radiolarian | |
? Stichocapsa "sp. B" Haeckel 1881 radiolarian |