The Crassier Creek occurrence lies above Crassier Creek, 5 kilometres north of Pine River and 63 kilometres northeast of the town of Mackenzie.
A 3-centimetre seam of bentonite, in several hundred metres of Cretaceous Moosebar Formation (Fort St. John Group) shale and sandstone, was reported (Geological Survey of Canada Paper 43-13). A detailed description was not given.