The Buckinghorse River bentonite showing is located approximately 152 kilometres south of Fort Nelson along the Alaska Highway, approximately 23 kilometres north of the Sikanni Chief River Bridge and 1 kilometre south-southwest from the Buckinghorse Road intersection.

The Buckinghorse area is underlain by flat-lying Lower Cretaceous Fort St. John Group sediments conformably overlying Lower Cretaceous and Earlier Bullhead Group strata. The Fort St. John Group comprises 300 metres of Sikanni Formation marine sandstones and shales overlying 1100 metres of Buckinghorse Formation shales.

Three bentonite beds, ranging from 2.5 to 15.25 centimetres in width, occur in the basal 150 metres of the Buckinghorse Formation.