Diatomite occurs in a meadow located just east of Guichon Creek about 4 kilometres south of Tunkwa Lake. The diatomite occurs in undisturbed meadows from 1.8 to 3.6 metres above the present creek bed. Approximately 0.8 hectare of the meadow is underlain by 0.3 to 0.9 metre of white diatomite underlain by 0.3 to 0.9 metre of brown and yellow. The average thickness is about 0.9 metre with the best material occupying about 0.1 hectare at the east end. Both the white and the coloured diatomites calcine to a pale pink.