These cap the cliffs north of town and are 100–350 feet (30–107 m) thick.

[4] The formation was first named as the Bluff Sandstone by A.A. Baker, C.H.

Irwin promoted it to formation rank in 1957,[6] but this was not universally accepted.

[7][8] Spencer G. Lucas advocated both for formation rank and for assigning the Recapture Member to the Bluff Sandstone.

[3] Steven M. Cather agreed with promotion of the Bluff Sandstone to formation rank but advocated leaving the Recapture Member with the Morrison Formation.