[1][2] The formation is noted for its highly fossiliferous oyster beds, which compose of the species Praeexogyra hebridica.

The Duntulm Formation is noted for its oyster beds, composed of a shale or limestone matrix, and can range up to 2 m in thickness.

[1][4] The type section for the formation is exposed as a wave cut platform at Cairidh Ghlumaig (Duntulm), northwest Trotternish on the Isle of Skye.

The basin wide transition from marine-brackish to freshwater conditions is represented in lithofacies 5 - composed of terrestrial spores and pollen in muds and sands.

During this time, the lagoonal complex became increasingly closed from marine influence and mudflat - as characterised in the succeeding Kilmaluag Formation.

A series of Breviparopus sauropod tracks and narrow gauge trackways were identified in beds 9b, 34, and 35 in the type section at Cairidh Ghlumaig in 2015.

The greatest concentration of tracks occur on a wave cut platform composed of bed 35 and are exposed during low tides.