Word Formation
# 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
