Graceland Mines about 4 miles nothwest 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; lithology not reported

Size class: macrofossils

Preservation: cast, recrystallized, 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 99877: authorized by Björn Kröger, entered by Björn Kröger on 26.11.2010

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Cephalopoda
 Ellesmerocerida - Ellesmeroceratidae
Copiceras erectum1
Copiceras erectum1 Ulrich et al. 1944
several specimens
 Tarphycerida - Tarphyceratidae
Pionoceras smithvillense
Pionoceras smithvillense Ulrich et al. 1942
 Multiceratoidea - Cyclostomiceratidae
Cyclostomiceras depressum2
Cyclostomiceras depressum2 Ulrich et al. 1943
1Ulrich et al. 1944; 2Ulrich et al. 1943