Muddy Creek Plesiosaur Site (Lower Horizon): Cenomanian, Utah

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Cephalopoda - Ammonitida - Acanthoceratidae
Metoicoceras geslinianum (d'Orbigny 1841)
Cephalopoda - Ammonitida - Placenticeratidae
Placenticeras cumminsi (Cragin 1893)
Cephalopoda - Ammonitida - Anisoceratidae
Allocrioceras annulatum
based on collection of Swensen 1962
Cephalopoda - Ammonitida - Baculitidae
Sciponoceras gracile (Shumard 1860)
Gastropoda - Turritellidae
Turritella whitei
Bivalvia - Myalinida - Inoceramidae
Inoceramus pictus Sowerby 1829
recombined as Inoceramus (Inoceramus) pictus
see common names

Geography
Country:United States State/province:Utah County:Kane
Coordinates: 37.3° North, 112.7° West (view map)
Paleocoordinates:39.0° North, 75.4° West
Basis of coordinate:estimated from map
Geographic resolution:small collection
Time
Period:Cretaceous Epoch:Late/Upper Cretaceous
Stage:Cenomanian 10 m.y. bin:Cretaceous 5
*Period:Late/Upper Cretaceous *Epoch:Gallic
*International age/stage:Middle - Late/Upper Cenomanian
Key time interval:Cenomanian Ammonoid zone: Sciponoceras gracile
Age range of interval:100.50000 - 93.90000 m.y. ago
* legacy (obsolete) database fields
Stratigraphy
Formation:Tropic Shale
Stratigraphic resolution:bed
Lithology and environment
Primary lithology:concretionary,gray lime mudstone
Lithology description: medium gray, non-septarian, spheroidal, micrite concretions
Environment:marine indet.
Geology comments: ammonites found in concretions, bivalves "near the margin of the concretions"
Taphonomy
Modes of preservation:concretion
Collection methods and comments
Collection methods:field collection
Reason for describing collection:biostratigraphic analysis
Metadata
Database number:5608
Authorizer:J. Alroy Enterer:J. Alroy
Modifier:A. Hendy Research group:marine invertebrate
Created:1999-10-31 14:23:28 Last modified:2009-05-25 00:11:36
Access level:the public Released:1999-10-31 14:23:28
Creative Commons license:CC BY
Reference information

Primary reference:

339. D. D. Gillette, M. C. Hayden, and A. L. Titus. 1999. Occurrence and biostratigraphic framework of a plesiosaur from the Upper Cretaceous Tropic Shale of southwestern Utah. Utah Geological Survey Miscellaneous Publication 99(1):269-273 [J. Alroy/J. Alroy/M. Uhen]