Where: Marin County, California (37.8° N, 122.5° W)
• coordinate estimated from map
• outcrop-level geographic resolution
When: Bajocian (170.3 - 168.3 Ma)
• Assemblage MH-3: The possible range of assemblage MH-3 is considered to be Middle Jurassic (Bajocian to Callovian) and possibly lower Upper Jurassic (Oxfordian?, Kimmeridgian?). Restricted to Bajocian 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 185254: authorized by Matthew Clapham, entered by Matthew Clapham on 17.04.2017
Creative Commons license: CC BY (attribution)
Taxonomic list
| Protozoa | |
|
Ristola "sp. A" Pessagno and Whalen 1982 radiolarian | |
"Tricolocapsa cf. plicarum" = Striatojaponocapsa plicarum, Tricolocapsa "sp. B"
"Tricolocapsa cf. plicarum" = Striatojaponocapsa plicarum Yao 1979 radiolarian
Tricolocapsa "sp. B" Haeckel 1881 radiolarian | |
|
Hsuum "sp. C" Pessagno 1977 radiolarian | |
|
Foremanina "sp. A" Empson-Morin 1981 radiolarian | |
|
Pachyoncus sp. Pessagno and Blome 1980 radiolarian | |