A west dipping limestone lens of the Upper Triassic Vancouver Group, Quatsino Formation trends north for 3 kilometres to the headwaters of Handy Creek, 23 kilometres south-southwest of Port Alberni.

The Handy Creek lens is terminated by a fault to the south and pinches out to the north between overlying Lower Jurassic Bonanza Group volcanics and sediments and underlying basalts and andesites of the Upper Triassic Karmutsen Formation, Vancouver Group. Exposed widths vary up to 1500 metres.