Fossil ornithopod tracks have been reported from the formation.
[1] A stratigraphic column at the Mount Bonnell Fault location reveals the following sequence: the Lower Cretaceous Trinity Group is overlain by the Edwards Group.
This is followed by Upper Cretaceous formations, starting with the Del Rio Clay, then the Buda Limestone, and finally the Eagle Ford Group.
The Hammett and the lower portion of the Upper Glen Rose act as confining units (or aquitard) for the Middle Trinity Aquifer.
This article about a specific stratigraphic formation in the United States is a stub.