Ulrich 281-b (= Ulrich station 310). 4 miles south of Chadwick. Forsyth quad. (Ordovician of the United States)

Also known as Road between Swan & Elkhorn Creek

Where: Christian County, Missouri (36.9° N, 93.1° W: paleocoordinates 23.3° S, 78.1° W)

• coordinate based on political unit

• outcrop-level geographic resolution

When: Cotter Formation, Cassinian (482.3 - 470.0 Ma)

• formation-level stratigraphic resolution

Environment/lithology: lithified, red, argillaceous, cherty/siliceous dolomite

• Thick to thin-bedded, argillaceous and coarsely crystalline, light gray to buff dolomite beds separated locally by thin black to brownisn black dolomitic shale lamineae. Chert, etierh commonly gray banded or dark colored thin lentils or massive beds.

Size class: macrofossils

Preservation: replaced with silica

Primary reference: J. S. Cullison. 1944. The stratigraphy of some Lower Ordovician formations of the Ozark uplift. University of Missouri School of Mines and Metallurgy Technical Series Bulletin 15(2):1-112 [P. Wagner/P. Wagner]more details

Purpose of describing collection: general faunal/floral analysis

PaleoDB collection 56513: authorized by Pete Wagner, entered by Pete Wagner on 20.11.2005, edited by Björn Kröger

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Cephalopoda
 Tarphycerida - Estonioceratidae
Shumardoceras complanatum2
 Tarphycerida - Tarphyceratidae
Tarphyceras chadwickense2
Tarphyceras chadwickense2 Ulrich et al. 1942
Gastropoda
 Euomphalina - Helicotomidae
"Polhemia taneyensis" = Lophonema taneyensis
"Polhemia taneyensis" = Lophonema taneyensis Cullison 1944 snail
 Euomphalina - Raphistomatidae
Orospira bigranosa, "Lesueurilla grandis n. sp." = Bridgeites planidorsalis, "Lesueurilla supraconvexa n. sp." = Bridgeites supraconvexa
Orospira bigranosa Butts 1926 snail
"Lesueurilla grandis n. sp." = Bridgeites planidorsalis Cullison 1944 snail
"Lesueurilla supraconvexa n. sp." = Bridgeites supraconvexa Cullison 1944 snail
Rostroconchia
 Conocardiida - Eopteriidae
Eopteria richardsoni1
Eopteria richardsoni1 Billings 1865
Pl. 25 f. 16
1Pojeta and Runnegar 1976; 2Ulrich et al. 1942