Douglas County near Lawrence: Kasimovian, Kansas

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Chondrichthyes - Ctenacanthiformes - Ctenacanthidae
Ctenacanthus sp. Agassiz 1836
Cladodus sp. Agassiz 1843
Palaeonisciformes
Lawrenciella schaefferi n. gen., n. sp. Poplin 1984
see common names

Geography
Country:United States State/province:Kansas
Coordinates: 38.9° North, 95.2° West (view map)
Paleocoordinates:3.2° South, 28.2° West
Basis of coordinate:based on nearby landmark
Geographic resolution:local area
Time
Period:Carboniferous Epoch:Pennsylvanian
Stage:Kasimovian 10 m.y. bin:Carboniferous 5
Key time interval:Kasimovian
Age range of interval:307.00000 - 303.70000 m.y. ago
Stratigraphy
Formation:Lawrence Member:Haskell Limestone
Stratigraphic resolution:group of beds
Stratigraphy comments: Basal Virgilian. The nodules occur immediately above the Haskell limestones, which are of marine origin, and at the base of the Robbins shale originated in brackish waters.
Lithology and environment
Primary lithology:concretionary,sideritic lithified "shale"
Environment:estuary/bay
Geology comments: According to Miller and Swineford (1957), the nodules are genetically linked to the Haskell limestone and the fossils fauna is different from that in the Robbins shale. They concluded that the nodules were formed in a nearshore environment, probably within shallow marine basins formed in a subtropical and humid area. The bottom condition of these basins was probably quiet, anoxic, without strong currents nor overturning at the time the nodules formed.
The Lawrence Formation in Douglas County, Kansas, is interpreted to have been deposited in an estuarine to coal-forming swamp and floodplain setting along a coastal delta plain.
Taphonomy
Modes of preservation:cast
Size of fossils:macrofossils
Collection methods and comments
Reason for describing collection:taxonomic analysis
Museum repositories:MNHN
Collection method comments: The nodules were collected in a concretion-rich area that was first reported and studied by Twenhofel and Dunbar (1914). An extensive paleoecological, stratigraphical and geochemical study about these nodules was later undertaken by Miller and Swineford (1957). Some specimens in Museum of Natural History, University of Kansas.
Metadata
Database number:117102
Authorizer:M. Clapham Enterer:M. Clapham
Modifier:M. Clapham Research group:vertebrate
Created:2011-09-15 10:56:42 Last modified:2020-12-05 23:04:55
Access level:the public Released:2011-09-15 10:56:42
Creative Commons license:CC BY
Reference information

Primary reference:
37629. C. Poplin. 1984. Lawrenciella schaefferi n. g. n. sp. (Pisces: Actinopterygii) and the use of endocranial characters in the classification of the Palaeonisciformes. Journal of Vertebrate Paleontology 4(3):413-421 [M. Clapham/M. Clapham]

Secondary references:

43489 M. H. Hamel and C. Poplin. 2008. The Braincase Anatomy of Lawrenciella schaefferi, Actinopterygian from the Upper Carboniferous of Kansas (USA). Journal of Vertebrate Paleontology 28(4):989-1006 [S. Peters/S. McMullen/S. McMullen]