Much of the area consists of sedementary sequences in the Farley and Rutherford formations within the Permain Dalwood Group.
These sequences consist of:
- mudstones
- sandstones
- conglomeratic sandstones
- shale
- coal
Southern areas comprise mostly of the Branxton Formation in the Maitland Group.
These sequences consists of:
- mudstone
- sandstone
- conglomerate
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