Section H, Unit 2, Arbuckle Mountains (Ordovician of the United States)

Where: Carters County, Oklahoma (34.5° N, 96.8° W: paleocoordinates 22.4° S, 71.4° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Amplexograptus manitoulinensis graptolite zone, Welling Formation (Viola Group), Maysvillian (452.0 - 449.5 Ma)

• Given as Unit 2 of the Viola, which is now Welling

• bed-level stratigraphic resolution

Environment/lithology: deep subtidal; burrowed, nodular, calcareous, cherty/siliceous mudstone

• Calcarenitic mudstone, dark-tan, wavybedded, burrowed, containing trilobite Cryptolithus sp.; nodular chert; slightly sandy

Size classes: macrofossils, mesofossils

Preservation: cast

Primary reference: L. P. Alberstadt. 1973. Articulate brachiopods of the Viola Formation (Ordovician) in the Arbuckle Mountains, Oklahoma. Oklahoma Geological Survey Bulletin 117:1-90 [M. Patzkowsky/Z. Krug/P. Wagner]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 184442: authorized by Pete Wagner, entered by Pete Wagner on 27.02.2017

Creative Commons license: CC BY (attribution)

Taxonomic list

• Brachiopods only.
Graptolithina
 Diplograptoidea - Diplograptidae
Orthograptus eucharis Hall 1865 diplograptoid