The area along Ghost Creek, west of the Yakoun River is underlain by sediments of the Upper Triassic to Lower Jurassic Kunga Group and conformably overlying Lower Jurassic Maude Group. The upper most formation of the Kunga Group, the Upper Triassic to Lower Jurassic Sandilands Formation, locally contains oil-bearing black argillites and shales.
A drill hole collared along MacMillan Bloedel's Branch 46 logging road, 0.6 kilometre northwest of Ghost Creek intersected a 242 metre section of Sandilands Formation, comprised of thinly interbedded siltstone, argillaceous siltstone, variably tuffaceous sandstone and shale, with minor lenses and interbeds of limestone. Bitumen is locally present throughout the section and is somewhat more abundant in the mid third of the interval at about 70 to 128 metres depth. Here, bitumen and oil seeps occur in fractures and brecciated zones.
A surface exposure of oil shale is reported to occur 4.8 kilometres up Ghost Creek from the Yakoun River, in the immediate vicinity of the drill hole. The exposure consists of a 30-metre thick section of oil shale striking east and dipping 15 degrees north.
This showing was diamond drilled by Intercoast Resources some time prior to 1985.