The Wellington seam, in the Early Campanian Northfield Member of the Upper Cretaceous Extension Formation (Nanaimo Group), is the main coal seam in the area. The seam varies from 0.9 to 1.2 metres in thickness and contains an irregular shale parting 0.6 to 1.5 metres thick. The Little Wellington seam (average thickness of approximately 55 centimetres) occurs approximately 11 metres above the main seam. The coal seams, although thin, are of good quality, and are interbedded with shale and sandstone. Refer to the Bebans mine (092GSW026) for a detailed description of the Wellington seam.

The outcrop area is bounded to the south and west by a northwest trending fault (down thrown to the northeast). The strata dips gently northeast approximately 10 degrees.