USGS MR 5101, Alexander Avenue, Marin Headlands (M-2aG): Pliensbachian, California
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Protozoa
- Nassellaria
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Nassellaria informal indet. A
Ehrenberg 1875
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Protozoa
- Nassellaria
- Ultranaporidae
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Napora informal sp. A
Pessagno 1977
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Jacus informal sp. A
De Wever 1982
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| synonym of Napora | |||||||
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Jacus informal sp. B
De Wever 1982
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| synonym of Napora | |||||||
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? Dumitricaella aff. cucurbitina
De Wever 1982
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Protozoa
- Nassellaria
- Eucyrtidiidae
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? Eucyrtidium informal sp. A
Ehrenberg 1847
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? Eucyrtidium informal sp. B
Ehrenberg 1847
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Stichocapsa informal sp. A
Haeckel 1881
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Protozoa
- Nassellaria
- Hsuidae
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? Hsuum informal sp. A
Pessagno 1977
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Protozoa
- Nassellaria
- Bagotidae
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Canutus rockfishensis
Pessagno and Whalen 1982
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Bagotum aff. modestum
Pessagno and Whalen 1982
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Protozoa
- Nassellaria
- Parvicingulidae
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Canoptum poissoni
Pessagno et al. 1979
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Canoptum anulatum
Pessagno and Poisson 1981
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Protozoa
- Nassellaria
- Syringocapsidae
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Katroma aff. neagui
Pessagno and Poisson 1981
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Protozoa
- Spumellaria
- Pantanelliidae
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Trillus elkhornensis
Pessagno and Blome 1980
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Pantanellium informal sp. A
Pessagno 1977
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| see common names | |||||||
Geography
| Country: | United States | State/province: | California | County: | Marin |
| Coordinates: | 37.8° North, 122.5° West (view map) | ||||
| Paleocoordinates: | 27.0° North, 57.7° West | ||||
| Basis of coordinate: | estimated from map | ||||
| Geographic resolution: | outcrop |
Time
| Period: | Jurassic | Epoch: | Early/Lower Jurassic |
| Stage: | Pliensbachian | 10 m.y. bin: | Jurassic 2 |
| Key time interval: | Pliensbachian | ||
| Age range of interval: | 192.90000 - 184.20000 m.y. ago |
Stratigraphy
| Stratigraphic resolution: | bed | ||||
| Stratigraphy comments: Assemblage MH-1: Pliensbachian (probably late) and (or) Toarcian. Only Pliensbachian, according to Kohnen & Murchey, 1995. | |||||
Lithology and environment
| Primary lithology: | lithified chert |
| Environment: | basinal (siliceous) |
Taphonomy
| Modes of preservation: | body |
| Size of fossils: | macrofossils |
Collection methods and comments
| Reason for describing collection: | biostratigraphic analysis |
| Museum repositories: | USGS |
Metadata
| Database number: | 185250 | ||
| Authorizer: | M. Clapham | Enterer: | M. Clapham |
| Modifier: | M. Clapham | Research group: | micropaleontology |
| Created: | 2017-04-17 22:26:54 | Last modified: | 2017-04-22 19:42:27 |
| Access level: | the public | Released: | 2017-04-17 22:26:54 |
| Creative Commons license: | CC BY |
Reference information
Primary reference:
| 62145. | 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] |