Loc. 1. USGS 14369. Road cut on se side US 65, 0.8 km sw of Peyton Creek Bridge (Carboniferous of the United States)

Also known as 6.4 kilometers southeast of Leslie. USGS Locs: 16257-PC, 25011-PC, 25012-PC, 25021-PC, 22671-PC, 26556-PC, 28537-PC

Where: Van Buren County, Arkansas (35.8° N, 92.5° W: paleocoordinates 12.4° S, 34.0° W)

• coordinate estimated from map

• small collection-level geographic resolution

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

• 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)

• bed-level stratigraphic resolution

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

• "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."
• ...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 5517: authorized by John Alroy, entered by Mike Sommers on 08.10.1999, edited by Pete Wagner and Matthew Clapham

Creative Commons license: CC BY (attribution)

Taxonomic list

• Crinoids, bryozoans, brachiopods, bivalves, corals, nautiloids also present.
unclassified
  -
Rostroconchia
 Conocardiida - Bransoniidae
"Pseudoconocardium polymitarium n. sp." = Apotocardium polymitarium2, "Pseudoconocardium ? snideri" = Apotocardium snideri2
"Pseudoconocardium polymitarium n. sp." = Apotocardium polymitarium2 Hoare et al. 1982
"Pseudoconocardium ? snideri" = Apotocardium snideri2 Morgan 1924
Bivalvia
 Arcida - Parallelodontidae
 Myalinida - Myalinidae
? Naiadites sp. Dawson 1860 clam
Septimyalina cf. perattenuata Meek and Hayden 1858 clam
 Pectinida - Euchondriidae
Euchondria sp. Meek 1874 scallop
 Pectinida - Aviculopectinidae
Imoella obscura n. gen. n. sp. Hoare et al. 1989 scallop
Aviculopecten spp. M'Coy 1851 scallop
 Ostreida - Pterineidae
Caneyella cf. wapanuckensis Girty 1909 oyster
 Carditida - Astartidae
 Cardiidia - Sanguinolitidae
Wilkingia cf. inflata Easton 1962 clam
"? Sphenotus sp." = Sanguinolites M'Coy 1844 clam
Sphenotus pisinnus n. sp. Hoare et al. 1989 clam
Sanguinolites ? simulans Girty 1910 clam
 Cardiidia - Grammysiidae
Ectogrammysia crassatis n. gen. n. sp. Hoare et al. 1989 clam
Sedgwickia sp. McCoy 1844 clam
Asketomorpha grandis n. gen. n. sp. Hoare et al. 1989 clam
"Prothyris (? Prothyris) sp." = Prothyris Meek 1871 clam
Prothyris (Lophoprothyris) crista n. sp. Hoare et al. 1989 clam
Solenomorpha nitida Girty 1910 clam
 Cardiida - Kalenteridae
Permophorus sp. Chavan 1954 clam
 Trigoniida - Schizodidae
Schizodus chesterensis Meek and Worthen 1860 clam
 Nuculida - Nuculidae
"Nuculopsis okawensis" = Nuculavus okawensis Schenck 1939 nut clam
Nuculopsis "sp. B" Girty 1912 nut clam
Nuculopsis shumardana Hall 1856 nut clam
Economolopsis gordoni n. gen. n. sp. Hoare et al. 1989 nut clam
 Protobranchia -
Palaeoneilo sera Girty 1910 clam
Spathelopsis browni n. gen. n. sp. Hoare et al. 1989 clam
 Protobranchia - Sareptidae
Paleyoldia angustia n. sp. Hoare et al. 1989 clam
Paleyoldia bruta n. sp. Hoare et al. 1989 clam
 Protobranchia - Nuculanidae
Phestia obtusa n. sp. Hoare et al. 1989 pointed nut clam
Phestia corrugata n. sp. Hoare et al. 1989 pointed nut clam
Phestia wortheni n. sp. Hoare et al. 1989 pointed nut clam
Gastropoda
 Cyrtoneritimorpha - Orthonychiidae
"Platyceras (? Orthonychia) sp." = Orthonychia3
"Platyceras (? Orthonychia) sp." = Orthonychia3 Hall 1843 snail
 Neritoina - Delphinulopsidae
"Naticopsis (? Marmolatella) sp." = Marmolatella3, Naticopsis (Marmolatella) imoensis n. sp.3, Naticopsis (Marmolatella) macgordoni n. sp.3
"Naticopsis (? Marmolatella) sp." = Marmolatella3 Kittl 1894 snail
Naticopsis (Marmolatella) imoensis n. sp.3 Jeffery et al. 1994 snail
Naticopsis (Marmolatella) macgordoni n. sp.3 Jeffery et al. 1994 snail
 Trochonematoidea - Lophospiridae
"Worthenia (Yochelsonospira) tenuilineata" = Yochelsonospira tenuilineata3
"Worthenia (Yochelsonospira) tenuilineata" = Yochelsonospira tenuilineata3 Girty 1929 snail
 Euomphalina - Euomphalidae
"Straparollus (Euomphalus) intermedius" = Amphiscapha intermedius3, Straparollus (Euomphalus) variabilis n. sp.3, Straparollus (Euomphalus) konobasis n. sp.3
"Straparollus (Euomphalus) intermedius" = Amphiscapha intermedius3 Gordon and Yochelson 1983 snail
Straparollus (Euomphalus) variabilis n. sp.3 Jeffery et al. 1994 snail
Straparollus (Euomphalus) konobasis n. sp.3 Jeffery et al. 1994 snail
 Euomphalina - Platyceratidae
Platyceras (Platyceras) sp.3 Conrad 1840 snail
 Prosobranchia - Imoglobidae
"Globozyga grandyensis" = Imogloba gandyensis3
"Globozyga grandyensis" = Imogloba gandyensis3 Gordon and Yochelson 1987 snail
 Prosobranchia - Meekospiridae
Girtyspira microspirula n. sp.3 Jeffery et al. 1994 snail
Meekospira minuta3 Weller 1916 snail
 Prosobranchia - Strobeidae
Globozyga mediocris n. sp.3 Jeffery et al. 1994 snail
 Bellerophontida - Bellerophontidae
Bellerophon (Bellerophon) welshi3 Gordon and Yochelson 1987 snail
Retispira yochelsoni n. sp.3 Jeffery et al. 1994 snail
Retispira aff. ordinata3 Gordon and Yochelson 1987 snail
Patellilabia rhombadella n. sp.3 Jeffery et al. 1994 snail
Patellilabia sulcata n. sp.3 Jeffery et al. 1994 snail
 Bellerophontida - Euphemitidae
Euphemites chesterensis n. sp.3 Jeffery et al. 1994 snail
Euphemites whirligigi n. sp.3 Jeffery et al. 1994 snail
 Neritoidea - Naticopsidae
"Naticopsis (Naticopsis) genevievensis" = Naticopsis genevievensis3, Naticopsis (Naticopsis) cf. clinovata3
"Naticopsis (Naticopsis) genevievensis" = Naticopsis genevievensis3 Meek and Worthen 1867 snail
Naticopsis (Naticopsis) cf. clinovata3 Gordon and Yochelson 1987 snail
 Murchisoniina - Gosseletinidae
Trepospira (Angyomphalus) desultoria n. sp.3 Jeffery et al. 1994 snail
Glabrocingulum (Glabrocingulum) coronulum n. sp.3 Jeffery et al. 1994 snail
Glabrocingulum (Glabrocingulum) parasolum n. sp.3 Jeffery et al. 1994 snail
Glabrocingulum (Glabrocingulum) parvanodum3 Jeffery et al. 1994 snail
"Glabrocingulum (Glabrocingulum) binodosum" = Glabrocingulum binodosum3 Sadlick and Nielsen 1963 snail
"Glabrocingulum (Glabrocingulum) quadrigatum" = Glabrocingulum quadrigatum3 Sadlick and Nielsen 1963 snail
 Murchisoniina - Soleniscidae
Cephalopoda
 Orthocerida - Orthoceratidae
 Actinocerida - Carbactinoceratidae
Rayonnoceras protentum n. sp.1 Gordon 1964
 Goniatitida - Anthracoceratidae
Anthracoceras paucilobum1 Phillips 1836 ammonite
 Goniatitida - Glaphyritidae
"Cravenoceras miseri" = Stenoglaphyrites miseri1
"Cravenoceras miseri" = Stenoglaphyrites miseri1 Gordon 1964 ammonite
 Nautilida - Liroceratidae
"Liroceras bicostatum n. sp." = Bistrialites bicostatus1
"Liroceras bicostatum n. sp." = Bistrialites bicostatus1 Gordon 1964 nautiloid
 Nautilida - Trigonoceratidae
Imonautilus meeki n. gen. n. sp.4 Niko and Mapes 2007 nautiloid
Aphelaeceras arkansanum4 Gordon 1964 nautiloid
Epistroboceras sp.4 Turner 1954 nautiloid
Epistroboceras lesliense n. sp.4 Niko and Mapes 2007 nautiloid
 Pseudorthocerida - Spyroceratidae
Euloxoceras angustius n. sp.1 Gordon 1964
Reticycloceras peytonense n. sp.1 Gordon 1964
Dolorthoceras incisum1 Gordon 1964
? Tripteroceroides sp.1 Miller and Furnish 1940
Anthozoa
 Tabulata -
Tectamichelina mangeri n. gen. n. sp.5
Tectamichelina mangeri n. gen. n. sp.5 tabulate coral
 Stauriida - Antiphyllidae
? Bradyphyllum sp.5 Grabau 1928 horn coral
Bradyphyllum lesliense n. sp.5 horn coral
 Stauriida - Hapsiphyllidae
Amplexizaphrentis sp.5 Vaughan 1906 horn coral
Amplexizaphrentis maneri n. sp.5 horn coral
 Stauriida - Lophophyllidiidae
Lophophyllidium imoense n. sp.5 horn coral
? Lophophyllidium sp.5 Grabau 1928 horn coral
 Stauriida - Lophophyllidae
? Lophamplexus sp.5 Moore and Jeffords 1941 horn coral