The Rolla Ferry occurrence lies 400 metres east of the Rolla Ferry north landing, approximately 50 kilometres east south-east of the town of Fort St. John.
Lower Cretaceous Fort St. John Group clay-rich shales were sampled by the Industrial Mineral Division of the Department on Mines and Technical Surveys in 1959. Shale outcrops in deep stream valleys and along roadcuts. The samples were collected as part of a regional program testing the ceramic properties of various clay-rich deposits.