Where: Marin County, California (37.8° N, 122.5° W: paleocoordinates 27.0° N, 57.7° W)
• coordinate estimated from map
• outcrop-level geographic resolution
When: Pliensbachian (190.8 - 182.7 Ma)
• Assemblage MH-1: Pliensbachian (probably late) and (or) Toarcian. Only Pliensbachian, according to 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 185288: authorized by Matthew Clapham, entered by Matthew Clapham on 18.04.2017
Creative Commons license: CC BY (attribution)
Taxonomic list
| Protozoa | |
|
Nassellaria "indet. A" Ehrenberg 1875 radiolarian | |
|
Canutus rockfishensis Pessagno and Whalen 1982 radiolarian
Bagotum aff. modestum Pessagno and Whalen 1982 radiolarian | |
|
? Eucyrtidium "sp. B" Ehrenberg 1847 radiolarian
? Stichomitra "sp. A" Cayeux 1897 radiolarian | |
|
Katroma aff. neagui Pessagno and Poisson 1981 radiolarian | |
|
Canoptum poissoni Pessagno et al. 1979 radiolarian | |