Loc. 2. USGS 16058. Dirt road on e. side of Little Red River, 0.48 km se US 65: Serpukhovian, Arkansas

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Gastropoda - Euomphalina - Euomphalidae
Straparollus (Euomphalus) variabilis Jeffery et al. 1994
Jeffery et al. 1994
Bivalvia - Nuculida - Nuculidae
Nuculopsis okawensis (Schenck 1939)
recombined as Nuculavus okawensis
Cephalopoda - Nautilida - Trigonoceratidae
Imonautilus meeki Niko and Mapes 2007
Niko and Mapes 2007 1 specimen
see common names

Geography
Country:United States State/province:Arkansas County:Searcy
Coordinates: 35.8° North, 92.6° West (view map)
Paleocoordinates:12.3° South, 34.0° West
Basis of coordinate:estimated from map
Geographic resolution:small collection
Time
Period:Carboniferous Epoch:Mississippian
Stage:Serpukhovian 10 m.y. bin:Carboniferous 3
Key time interval:Serpukhovian
Age range of interval:330.90000 - 323.20000 m.y. ago
Stratigraphy
Formation:Imo
Regional section:Elvirian Regional bed:30 m
Regional order:bottom to top
Stratigraphic resolution:bed
Stratigraphy comments: Elvirian (E2b-c); Appx 30 m above base of fm. JA: late Chesterian is Serpukhovian according to Mii et al. 1999 (GSA Bull 111:960-973)
Lithology and environment
Primary lithology:concretionary,black,gray lithified sandy grainstone
Secondary lithology: "shale"
Lithology description: ...as much as 104 m of dark-gray to black, fissile, clay shale w/ numerous, large, bright-red, orange, or brown concretions. ...the lower 36 m...contains thin limestones, sandstones, and conglomerates.
Environment:offshore Tectonic setting:cratonic basin
Geology comments: "The environment of deposition...relatively shallow water, low energy offshore area undergoing slow continuous deposition of terrigenous clay with periodic higher-energy incursions of carbonate sediments."
Taphonomy
Modes of preservation:body
Collection methods and comments
Collection excludes:some macrofossils
Reason for describing collection:taxonomic analysis
Museum repositories:OSU,USNM
Metadata
Also known as:2.4 km south of Leslie
Database number:69282
Authorizer:P. Wagner Enterer:P. Wagner
Modifier:P. Wagner Research group:marine invertebrate
Created:2007-02-23 21:58:36 Last modified:2008-03-14 20:52:38
Access level:the public Released:2007-02-23 21:58:36
Creative Commons license:CC BY
Reference information

Primary reference:
19978. R. D. Hoare, M. J., I.I.I. Heaney, and R. H. Mapes. 1989. Bivalves (Mollusca) from the Imo Formation (Mississippian, Chesterian) of North-Central Arkansas. Journal of Paleontology 63(5):582-603 [P. Wagner/P. Wagner]

Secondary references:

11422 D. L. Jeffery, R.D. Hoare, R.H. Mapes and C.J. Brown. 1994. Gastropods (Mollusca) from the Imo Formation (Mississippian, Chesterian) of north-central Arkansas. Journal of Paleontology 68(1):58-79 [P. Wagner/P. Wagner/P. Wagner]
26726 S. Niko and R. H. Mapes. 2007. Trigonoceratid nautilids from the Early Carboniferous Imo Formation of Arkansas, Midcontinent North America. Paleontological Research 11(3):293-303 [P. Wagner/P. Wagner/P. Wagner]