3.7 miles east of Zalma on Highway 51 (Ordovician to of the United States)

Where: Bollinger County, Missouri (37.1° N, 90.1° W: paleocoordinates 24.8° S, 79.8° W)

• coordinate based on nearby landmark

When: Cotter Formation, Tulean to Tulean (485.4 - 471.8 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 98456: authorized by Björn Kröger, entered by Björn Kröger on 07.10.2010

Creative Commons license: CC BY (attribution)

Taxonomic list

Cephalopoda
 Tarphycerida - Estonioceratidae
Pycnoceras clausum Ulrich et al. 1942
 Tarphycerida - Trocholitidae
Wichitoceras compressum Ulrich et al. 1942
termed as "questionable"