PBDB Collection

Iowa Mine about 2 miles north of Smithville (Ordovician of the United States)

Where: Lawrence County, Arkansas (36.1° N, 91.3° W: paleocoordinates 24.8° S, 78.7° W)

• coordinate based on nearby landmark

When: Smithville Formation, Floian (477.7 - 470.0 Ma)

Environment/lithology: marine; limestone

Size class: macrofossils

Preservation: original aragonite, replaced with calcite

Primary reference: E. O. Ulrich, A. F. Foerste, A. K. Miller and W. M. Furnish. 1942. Ozarkian and Canadian cephalopods, Part I: Nautilicones. Geological Society of America Special Papers 37:1-157 [B. Kröger/B. Kröger/B. Kröger]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 99119: authorized by Björn Kröger, entered by Björn Kröger on 27.10.2010, edited by Pete Wagner

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names

Cephalopoda
Tarphycerida - Tarphyceratidae	Cycloplectoceras miseri Cycloplectoceras miseri Ulrich et al. 1942
Multiceratoidea - Cyclostomiceratidae	Cyclostomiceras depressum² Cyclostomiceras depressum² Ulrich et al. 1943
Orthocerida - Baltoceratidae	Ogygoceras gracile¹ Ogygoceras gracile¹ Ulrich et al. 1944 USNM 109501
Gastropoda
Murchisoniina - Hormotomidae	Hormotoma anna³ Hormotoma anna³ Billings 1859 snail
Murchisoniina - Eotomariidae	"Clathrospira laflinensis" = Clathrospira virguncula³ "Clathrospira laflinensis" = Clathrospira virguncula³ Billings 1865 snail
Euomphalina - Macluritidae	Teiichispira odenvillensis³ Teiichispira odenvillensis³ Butts 1926 snail
Euomphalina - Raphistomatidae	Ceratopea unguis³ Ceratopea unguis³ Yochelson and Bridge 1957 snail
Rostroconchia
Conocardiida - Eopteriidae	Eopteria richardsoni³ Eopteria richardsoni³ Billings 1865 personal observation USNM 9/95

¹Ulrich et al. 1944; ²Ulrich et al. 1943; ³Wagner 2023