The Watts Point occurrence is underlain by Pliocene to Recent Garibaldi Group dacite flows that forms a circular pile with an 800 metre radius. Granodiorite of the Cenozoic-Mesozoic Coast Plutonic Complex surrounds the flows.

The volcanic pile is comprised of numerous individual dacite flows that appear to strike west with slight dips to the south. Columnar jointing is well developed in several places and is oriented vertically and locally horizontally. Some of the columns are 4.5 metres high and their faces range from 7 to 30 centimetres wide. The faces of the columns contain local, closely spaced cross-joints. The dacite flows are commonly vesicular and vary in colour from bluish-grey to glassy black. Flattened vesicles within the flows are up to 2 centimetres long and 1 by 1.5 centimetres in cross-section. In thin section the rock displays a trachytic texture and consists essentially of plagioclase microlites and zoned crystals, pyroxene, amphibole, magnetite and abundant brown glass.

In 1974, a crushing and screening plant was installed and twelve men produced 480,710 tonnes of crushed and sized dacite rock (Geology, Exploration and Mining in B.C. 1974). The quarry produced 25 millimetres Well Graded Base. This private quarry was closed in 1979.