The Churn Creek zeolite occurrence occurs within Eocene volcanic rocks which form an overlap assemblage on older rocks. These volcanics are correlative with the Kamloops Group east of the Fraser fault.

The location is that of the westernmost occurrence of rhyolitic crystal and lapilli tuff in the Churn Creek area, approximately ten to twenty metres thick. Structurally overlying the rhyolite is red to pink andesitic breccia. X-ray diffraction analysis of samples from this exposure identified the presence of clinoptilolite-heulandite group zeolites.