The Ward Canyon zeolite showing occurs within rhyolitic volcanic rocks of Eocene age which are probably correlative with the Kamloops Group to the east of the Fraser River. The Eocene volcanic rocks on the eastern part of the Chilcotin Plateau are largely drift covered but good exposures occur in creeks draining from the Chilcotin Plateau down to the Fraser River.

In Ward Canyon, steeply dipping rhyolite breccia, which is probably variably zeolitized, is exposed in the canyon walls. Heating a rhyolite sample for 16 hours at 475 degrees celsius indicates that the composition is clinoptilolite-rich. Exchangeable cation analyses, expressed in milli-equivalents per 100 grams, yield: calcium, 29.25; magnesium, 2.75; sodium, 38.50; and potassium, 5.25. The cation exchange capacity (CEC) was 72.3.