The Middle and Upper
Triassic is represented by basal conglomerates overlain by
marine volcaniclastics with Daonella and Halobia bivalves.
The latest Triassic and Early and Mid-Jurassic appear to be
absent. Upper Jurassic and Lower to Middle Cretaceous
sediments are represented by shallow-marine limestones,
clastics and volcaniclastics (Metcalfe, 1988).