Crowley's Ridge: Late/Upper Maastrichtian, Missouri

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Cephalopoda - Ammonitida - Sphenodiscidae
Sphenodiscus pleurisepta (Conrad 1857)
Sphenodiscus lobatus (Tuomey 1856)
Cephalopoda - Ammonitida - Scaphitidae
Discoscaphites minardi Landman et al. 2004
Discoscaphites iris Conrad 1858
Discoscaphites sphaeroidalis Kennedy and Cobban 2000
Cephalopoda - Ammonitida - Baculitidae
Eubaculites latecarinatus (Brunnschweiler 1966)
Eubaculites carinatus (Morton 1834)
Baculites sp. Lamarck 1799
unclassified
Disphaerogena carposphaeropsis Wetzel 1933
Palynodinium grallator Gocht 1970
see common names

Geography
Country:United States State/province:Missouri County:Stoddard
Coordinates: 37.0° North, 89.9° West (view map)
Paleocoordinates:40.7° North, 66.3° West
Basis of coordinate:stated in text
Geographic resolution:small collection
Time
Period:Cretaceous Epoch:Late/Upper Cretaceous
Stage:Maastrichtian 10 m.y. bin:Cretaceous 8
Key time interval:Late/Upper Maastrichtian Ammonoid zone: Discoscaphites iris
Age range of interval:70.60000 - 66.00000 m.y. ago
Stratigraphy
Formation:Owl Creek
Stratigraphic resolution:formation
Lithology and environment
Primary lithology:gray silty sandstone
Lithology description: "An excavation at Crowley's Ridge revealed fresh vertical exposures of the uppermost Maastrichtian Owl Creek Formation unconformably overlain by the Paleocene Clayton Formation. The Owl Creek Formation is composed of a 1.5 m thick fining upward massive, bioturbated, fossiliferous, mottled yellowish gray micaceous, glauconitic, quartz-rich silty fine-grained sand with scattered pods. The upper 0.5 m of the Owl Creek Formation weathers orange. The contact between the Owl Creek Formation and Clayton Formation is sharp, slightly bioturbated, and undulating. The Clayton Formation consists of a 0.5 m thick fossiliferous, bioturbated, green glauconitic muddy, fine-grained sand. The majority of the fossils in the Clayton Formation are diagenetically altered to white clay." (Larina et al. 2016)
Environment:marginal marine indet.
Taphonomy
Modes of preservation:body
Size of fossils:macrofossils,mesofossils,microfossils
Collection methods and comments
Collection methods:field collection
Reason for describing collection:biostratigraphic analysis
Museum repositories:AMNH
Taxonomic list comments:Taxon abundances by bed can be found in the original reference
Metadata
Also known as:AMNH Loc. 3458
Database number:205794
Authorizer:A. Dunhill Enterer:B. Allen
Modifier:B. Allen
Created:2019-10-22 09:19:10 Last modified:2019-10-22 09:24:03
Access level:the public Released:2019-10-22 09:19:10
Creative Commons license:CC BY
Reference information

Primary reference:

70564. E. Larina, M. Garb, N. Landman, N. Dastas, N. Thibault, L. Edwards, G. Phillips, R. Rovelli, C. Myers and J. Naujokaityte. 2016. Upper Maastrichtian ammonite biostratigraphy of the Gulf Coastal Plain (Mississippi Embayment, southern USA). Cretaceous Research 60:128-151 [A. Dunhill/B. Allen]