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
Ornithella syringothyrides n. sp. Crickmay 1933
(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]