Bringelly Shale is a component of the Wianamatta group of sedimentary rocks in the Sydney Basin of eastern Australia.

The shale is the topmost layer of sedimentary rock laid down by a river delta over the older Hawkesbury sandstone in the Triassic Period.

[1] It is similar to Ashfield Shale in that both have low porosities, though differing in having a greater amount of calcareous, graywacke-type, lithic sandstone bands and lenses, carbonaceous claystone, siltstone, laminite, but would lack sideritic mudstone bands that Ashfield Shale has.

Bringelly Shale has lumpy clay minerals, and it swells and decays rapidly on submergence in water and is generally less durable.

[3] It was deposited in a swampy alluvial plain with winding streams that formed sporadic beds of sandstone.