Gilead Creek (USGS Mes. loc. 22759): Late/Upper Oxfordian - Early/Lower Kimmeridgian, Alaska

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Bivalvia - Pectinida - Buchiidae
Aucella concentrica White 1888
see common names

Geography
Country:United States State/province:Alaska
Coordinates: 69.2° North, 147.7° West (view map)
Paleocoordinates:74.0° North, 52.2° West
Geographic resolution:small collection
Time
Period:Jurassic Epoch:Late/Upper Jurassic
10 m.y. bin:Jurassic 5
*Period:Late/Upper Jurassic *Epoch:Dogger
*International age/stage:Late/Upper Oxfordian - Early/Lower Kimmeridgian
Key time interval:Late/Upper Oxfordian - Early/Lower Kimmeridgian
Age range of interval:157.90000 - 152.20000 m.y. ago
* legacy (obsolete) database fields
Stratigraphy
Formation:Kingak Shale
Stratigraphic resolution:bed
Lithology and environment
Primary lithology:gray lithified "shale"
Secondary lithology: ironstone
Lithology description: dark gray shale containing large lenses of light gray ironstone
Environment:marine indet. Tectonic setting:foreland basin
Geology comments: "[These sediments] were deposited in an eastward-trending trough about 150 mi wide...the trough was bounded on the S by a rising landmass from which most of the sediments were derived. It was bounded on the N by the Barrow Platform..."

[ergo, foreland basin]

Taphonomy
Modes of preservation:body
Collection methods and comments
Collection methods:field collection
Reason for describing collection:biostratigraphic analysis
Museum repositories:USGS
Metadata
Database number:5228
Authorizer:J. Alroy Enterer:M. Sommers
Research group:marine invertebrate
Created:1999-09-02 17:41:06 Last modified:2001-08-30 17:52:51
Access level:the public Released:2000-11-20 13:53:25
Creative Commons license:CC BY
Reference information

Primary reference:
313. R. W. Imlay. 1955. Characteristic Jurassic Mollusks from northern Alaska. United States Geological Survey Professional Paper 274-D:69-96 [J. Alroy/M. Sommers]