Loc. 5. USGS 17692. low water concrete bridge across Big Piney Creek (Carboniferous of the United States)

Also known as USGS Locs: 28521-PC, 28522-PC, 28523-PC, 28525-PC. 0.32 km north of Newton-Hohnson County line, where another road takes off to the north.

Where: Newton County, Arkansas (35.7° N, 93.3° W: paleocoordinates 12.1° S, 34.5° W)

• coordinate estimated from map

• small collection-level geographic resolution

When: Imo Formation, Serpukhovian (330.9 - 323.2 Ma)

• Elvirian. Appx 30 m above base of fm. JA: late Chesterian is Serpukhovian according to Mii et al. 1999 (GSA Bull 111:960-973)

• bed-level stratigraphic resolution

Environment/lithology: offshore; lithified, concretionary, black, gray, sandy grainstone and shale

• ...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.

Reposited in the OSU, USNM

Primary reference: 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]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 5521: authorized by John Alroy, entered by Mike Sommers on 08.10.1999, edited by Pete Wagner

Creative Commons license: CC BY (attribution)

Taxonomic list

• Also present are crinoids, bryozoans, brachiopods, bivalves, corals, and nautiloids.
Gastropoda
 Euomphalina - Euomphalidae
Straparollus (Euomphalus) variabilis1 Jeffery et al. 1994 snail
Straparollus (Euomphalus) konobasis1 Jeffery et al. 1994 snail
 Bellerophontida - Euphemitidae
Euphemites whirligigi1 Jeffery et al. 1994 snail
 Bellerophontida - Bellerophontidae
Retispira yochelsoni1 Jeffery et al. 1994 snail
 Murchisoniina - Soleniscidae
 Murchisoniina - Gosseletinidae
Bivalvia
 Arcida - Parallelodontidae
Anthozoa
 Stauriida - Lophophyllidae
Lophophyllidium imoense n. sp.2 horn coral