Word Formation

The Word Formation is a geologic formation in Texas. It preserves fossils dating back to the Permian period. It is probably named for the Old Word Ranch in the Glass Mountains of Brewster County.

Defining formation
The Wordian age of the Permian Period is named for the Word Formation.

Subdivisions
The formation is subdivided into three members, from young to old:
 * Appel Ranch - Wordian
 * China Tank - Roadian
 * Willis Ranch - Roadian

Fossil content
The limestone formation contains marine gastropods, brachiopods and ammonites.

Vertebrate paleofauna

 * Helicoprion davisii