Genus: Eothyris ROMER, 1937

Species: parkeyi ROMER, 1937

Holotype: MCZ 1161

Locality: 1 mile west of the former Woodrum ranch-house, from Tit Mountain, just northeast of Dundee, Archer County, Texas.

Horizon: Petrolia Formation (formerly Belle Plains Formation, middle Wichita Group), Lower Wichita Group.

Biostratigraphy: Land-vertebrate faunachron upper B.

Age: Upper Wolfcampanian stage, Upper Rotliegendes Epoch, Early Permian.

Material: Skull and mandible.