Ravine 35 (trigona zone, 4100 ft), southwest slope of Mount Jura: Discites, California
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Rhynchonellata
- Terebratulida
- Zeilleriidae
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Ornithella syringothyrides n. sp.
Crickmay 1933
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(1 measurement) | ||||||||||
see common names |
Geography
Country: | United States | State/province: | California |
Coordinates: | 40.1° North, 120.8° West (view map) | ||
Paleocoordinates: | 33.2° North, 60.1° West | ||
Basis of coordinate: | based on nearby landmark | ||
Altitude: | 4100 feet | ||
Geographic resolution: | outcrop |
Time
Period: | Jurassic | Epoch: | Middle Jurassic |
Stage: | Bajocian | 10 m.y. bin: | Jurassic 4 |
Key time interval: | Discites | Ammonoid zone: | Sonninia alsatica |
Age range of interval: | 171.60000 - 167.70000 m.y. ago |
Stratigraphy
Formation: | Mormon | Member: | Mormon Sandstone | ||
Stratigraphic resolution: | group of beds | ||||
Stratigraphy comments: The trigona zone is associated with S. alsatica which is correlated with the upper Discites zone according to Riding 2010 ("New evidence for the age of the Athol Formation (Middle Jurassic; Bajocian) in the Tusk-1 and Tusk-2 wells, offshore Carnarvon Basin, Western Australia") |
Lithology and environment
Primary lithology: | fine,volcaniclastic,gray,green,red lithified muddy,conglomeratic sandstone |
Includes fossils? | Y |
Lithology description: Mainly fine gray arkose, with red and green conglomerate of volcanic debris at the base, and fine, dark gray paper shales at top | |
Environment: | marine indet. |
Taphonomy
Modes of preservation: | body |
Size of fossils: | macrofossils |
Collection methods and comments
Collection methods: | survey of museum collection |
Reason for describing collection: | taxonomic analysis |
Museum repositories: | GSC |
Metadata
Database number: | 164683 | ||
Authorizer: | M. Clapham | Enterer: | M. Manojlovic | Research group: | marine invertebrate |
Created: | 2014-12-10 18:12:53 | Last modified: | 2014-12-10 18:12:53 |
Access level: | the public | Released: | 2014-12-10 18:12:53 |
Creative Commons license: | CC BY |
Reference information
Primary reference:
53761. | C. H. Crickmay. 1933. Attempt to Zone the North American Jurassic on the Basis of its Brachiopods. Geological Society America Bulletin 44:871-894 [M. Clapham/M. Manojlovic] |