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: 21.7° S, 43.6° W (Wright 2013)

• 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: CC0 (CC0)

Taxonomic list

• Crinoids, bryozoans, brachiopods, bivalves, corals, nautiloids also present.
Show authors, comments, and common names
unclassified
  -
Trepspira "? n. sp."3
Bivalvia
 Nuculida - Nuculidae
Nuculopsis "sp. B", Nuculopsis shumardana, "Nuculopsis okawensis" = Nuculavus okawensis, Economolopsis gordoni n. gen. n. sp.
Nuculopsis "sp. B" Girty 1912 nut clam
Nuculopsis shumardana Hall 1856 nut clam
"Nuculopsis okawensis" = Nuculavus okawensis Schenck 1939 nut clam
Economolopsis gordoni n. gen. n. sp. Hoare et al. 1989 nut clam
 Nuculanida - Malletiidae
Palaeoneilo sera, Spathelopsis browni n. gen. n. sp.
Palaeoneilo sera Girty 1910 clam
Spathelopsis browni n. gen. n. sp. Hoare et al. 1989 clam
 Nuculanida - Sareptidae
Paleyoldia bruta n. sp., Paleyoldia angustia n. sp.
Paleyoldia bruta n. sp. Hoare et al. 1989 clam
Paleyoldia angustia n. sp. Hoare et al. 1989 clam
 Nuculanida - Polidevciidae
Phestia obtusa n. sp., Phestia wortheni n. sp., Phestia corrugata n. sp.
Phestia obtusa n. sp. Hoare et al. 1989 clam
Phestia wortheni n. sp. Hoare et al. 1989 clam
Phestia corrugata n. sp. Hoare et al. 1989 clam
 Carditida - Astartidae
Astartella cf. concentrica
 Cardiidia - Sanguinolitidae
Wilkingia cf. inflata, Sanguinolites ? simulans
Wilkingia cf. inflata Easton 1962 clam
Sanguinolites ? simulans Girty 1910 clam
 Cardiidia - Grammysiidae
Asketomorpha grandis n. gen. n. sp., Ectogrammysia crassatis n. gen. n. sp., "Prothyris (? Prothyris) sp." = Prothyris, Prothyris (Prothyris) cf. soleniformis, Prothyris (Lophoprothyris) crista n. sp., Sedgwickia sp., ? Sphenotus sp., Sphenotus pisinnus n. sp.
Asketomorpha grandis n. gen. n. sp. Hoare et al. 1989 clam
Ectogrammysia crassatis 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
Sedgwickia sp. McCoy 1844 clam
? Sphenotus sp. Hall 1884 clam
Sphenotus pisinnus n. sp. Hoare et al. 1989 clam
 Cardiida - Kalenteridae
Permophorus sp.
Permophorus sp. Chavan 1954 clam
 Solenida - Solenomorphidae
Solenomorpha nitida
Solenomorpha nitida Girty 1910 clam
 Trigoniida - Schizodidae
Schizodus chesterensis
Schizodus chesterensis Meek and Worthen 1860 clam
 Arcida - Parallelodontidae
Parallelodon cf. cancellosus
 Pectinida - Aviculopectinidae
Aviculopecten spp., Imoella obscura n. gen. n. sp.
Aviculopecten spp. M'Coy 1851 scallop
Imoella obscura n. gen. n. sp. Hoare et al. 1989 scallop
 Pectinida - Euchondriidae
Euchondria sp.
Euchondria sp. Meek 1874 scallop
 Ostreida - Pterineidae
Caneyella cf. wapanuckensis
Caneyella cf. wapanuckensis Girty 1909 oyster
 Myalinida - Myalinidae
? Naiadites sp., Septimyalina cf. perattenuata, Myalina (Myalina) cf. parallela
? Naiadites sp. Dawson 1860 clam
Septimyalina cf. perattenuata Meek and Hayden 1858 clam
Gastropoda
 Bellerophontida - Bellerophontidae
Bellerophon (Bellerophon) welshi3, Patellilabia sulcata n. sp.3, Patellilabia rhombadella n. sp.3, Retispira aff. ordinata3, Retispira yochelsoni n. sp.3
Bellerophon (Bellerophon) welshi3 Gordon and Yochelson 1987 snail
Patellilabia sulcata n. sp.3 Jeffery et al. 1994 snail
Patellilabia rhombadella n. sp.3 Jeffery et al. 1994 snail
Retispira aff. ordinata3 Gordon and Yochelson 1987 snail
Retispira yochelsoni n. sp.3 Jeffery et al. 1994 snail
 Bellerophontida - Euphemitidae
Euphemites chesterensis n. sp.3, Euphemites whirligigi n. sp.3
Euphemites chesterensis n. sp.3 Jeffery et al. 1994 snail
Euphemites whirligigi n. sp.3 Jeffery et al. 1994 snail
 Murchisoniina - Lophospiridae
"Worthenia (Yochelsonospira) tenuilineata" = Yochelsonospira tenuilineata3
"Worthenia (Yochelsonospira) tenuilineata" = Yochelsonospira tenuilineata3 Girty 1929 snail
 Murchisoniina - Gosseletinidae
"Glabrocingulum (Glabrocingulum) quadrigatum" = Glabrocingulum quadrigatum3, Glabrocingulum (Glabrocingulum) parvanodum3, Glabrocingulum (Glabrocingulum) parasolum n. sp.3, Glabrocingulum (Glabrocingulum) coronulum n. sp.3, "Glabrocingulum (Glabrocingulum) binodosum" = Glabrocingulum binodosum3, Trepospira (Angyomphalus) desultoria n. sp.3
"Glabrocingulum (Glabrocingulum) quadrigatum" = Glabrocingulum quadrigatum3 Sadlick and Nielsen 1963 snail
Glabrocingulum (Glabrocingulum) parvanodum3 Jeffery et al. 1994 snail
Glabrocingulum (Glabrocingulum) parasolum n. sp.3 Jeffery et al. 1994 snail
Glabrocingulum (Glabrocingulum) coronulum n. sp.3 Jeffery et al. 1994 snail
"Glabrocingulum (Glabrocingulum) binodosum" = Glabrocingulum binodosum3 Sadlick and Nielsen 1963 snail
Trepospira (Angyomphalus) desultoria n. sp.3 Jeffery et al. 1994 snail
 Murchisoniina - Soleniscidae
Strobeus "cf. sp. A Gordon & Yochelson 1987"3
 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
 Cyrtoneritida - Orthonychiidae
"Platyceras (? Orthonychia) sp." = Orthonychia3
"Platyceras (? Orthonychia) sp." = Orthonychia3 Hall 1843 snail
 Neritoina - Delphinulopsidae
"Naticopsis (? Marmolatella) sp." = Marmolatella3, Naticopsis (Marmolatella) macgordoni n. sp.3, Naticopsis (Marmolatella) imoensis n. sp.3
"Naticopsis (? Marmolatella) sp." = Marmolatella3 Kittl 1894 snail
Naticopsis (Marmolatella) macgordoni n. sp.3 Jeffery et al. 1994 snail
Naticopsis (Marmolatella) imoensis n. sp.3 Jeffery et al. 1994 snail
 Caenogastropoda - Imoglobidae
"Globozyga grandyensis" = Imogloba gandyensis3
"Globozyga grandyensis" = Imogloba gandyensis3 Gordon and Yochelson 1987 snail
 Caenogastropoda - Strobeidae
Globozyga mediocris n. sp.3
Globozyga mediocris n. sp.3 Jeffery et al. 1994 snail
 Caenogastropoda - Meekospiridae
Meekospira minuta3, Girtyspira microspirula n. sp.3
Meekospira minuta3 Weller 1916 snail
Girtyspira microspirula n. sp.3 Jeffery et al. 1994 snail
 Euomphalina - Euomphalidae
"Straparollus (Euomphalus) intermedius" = Amphiscapha intermedius3, Straparollus (Euomphalus) konobasis n. sp.3, Straparollus (Euomphalus) variabilis n. sp.3
"Straparollus (Euomphalus) intermedius" = Amphiscapha intermedius3 Gordon and Yochelson 1983 snail
Straparollus (Euomphalus) konobasis n. sp.3 Jeffery et al. 1994 snail
Straparollus (Euomphalus) variabilis n. sp.3 Jeffery et al. 1994 snail
 Euomphalina - Platyceratidae
Platyceras (Platyceras) sp.3
Platyceras (Platyceras) sp.3 Conrad 1840 snail
Cephalopoda
 Orthocerida - Orthoceratidae
Michelinoceras wapanuckense1
 Actinocerida - Carbactinoceratidae
Rayonnoceras protentum n. sp.1
Rayonnoceras protentum n. sp.1 Gordon 1964
 Ammonoida - Glaphyritidae
"Cravenoceras miseri" = Stenoglaphyrites miseri1
"Cravenoceras miseri" = Stenoglaphyrites miseri1 Gordon 1964 ammonite
 Ammonoida - Anthracoceratidae
Anthracoceras paucilobum1
Anthracoceras paucilobum1 Phillips 1836 ammonite
 Nautilida - Liroceratidae
"Liroceras bicostatum n. sp." = Bistrialites bicostatus1
"Liroceras bicostatum n. sp." = Bistrialites bicostatus1 Gordon 1964
 Nautilida - Trigonoceratidae
Aphelaeceras arkansanum4, Epistroboceras sp.4, Epistroboceras lesliense n. sp.4, Imonautilus meeki n. gen. n. sp.4
Epistroboceras sp.4 Turner 1954
Epistroboceras lesliense n. sp.4 Niko and Mapes 2007
Imonautilus meeki n. gen. n. sp.4 Niko and Mapes 2007
 Pseudorthocerida - Pseudorthoceratidae
Dolorthoceras incisum1
Dolorthoceras incisum1 Gordon 1964
 Pseudorthocerida - Spyroceratidae
Reticycloceras croneisi1, Reticycloceras peytonense n. sp.1, Euloxoceras angustius n. sp.1, ? Tripteroceroides sp.1
Reticycloceras peytonense n. sp.1 Gordon 1964
Euloxoceras angustius n. sp.1 Gordon 1964
? Tripteroceroides sp.1 Miller and Furnish 1940
Rostroconchia
 Conocardiida - Bransoniidae
"Pseudoconocardium ? snideri" = Apotocardium snideri2, "Pseudoconocardium polymitarium n. sp." = Apotocardium polymitarium2
"Pseudoconocardium ? snideri" = Apotocardium snideri2 Morgan 1924
"Pseudoconocardium polymitarium n. sp." = Apotocardium polymitarium2 Hoare et al. 1982
Anthozoa
 Stauriida - Lophophyllidae
Lophophyllidium imoense n. sp.5, ? Lophophyllidium sp.5, ? Lophamplexus sp.5
Lophophyllidium imoense n. sp.5 horn coral
? Lophophyllidium sp.5 Grabau 1928 horn coral
? Lophamplexus sp.5 Moore and Jeffords 1941 horn coral
 Stauriida - Hapsiphyllidae
Amplexizaphrentis sp.5, Amplexizaphrentis maneri n. sp.5
Amplexizaphrentis sp.5 Vaughan 1906 horn coral
Amplexizaphrentis maneri n. sp.5 horn coral
 Stauriida - Antiphyllidae
? Bradyphyllum sp.5, Bradyphyllum lesliense n. sp.5
? Bradyphyllum sp.5 Grabau 1928 horn coral
Bradyphyllum lesliense n. sp.5 horn coral
 Favositida - Micheliniidae
"Tectamichelina mangeri n. gen. n. sp." = Tectamichelinia5
"Tectamichelina mangeri n. gen. n. sp." = Tectamichelinia5 tabulate coral
1Gordon 1964; 2Hoare et al. 1982; 3Jeffery et al. 1994; 4Niko and Mapes 2007; 5Webb and Sutherland 1993