Bald Hill Claystone

Bald Hill Claystone is a sedimentary rock found in the Sydney Basin in eastern Australia.

It is part of the Clifton sub-group of the Narrabeen Group of sedimentary rocks.

[1] Named after Bald Hill, in the northern Illawarra, where it is 15 metres thick.

The claystone is easily noticed at Long Reef, where it is 18 metres thick.

Primarily a red shale or fine to medium grained sandstone.