Dacite columns are similar to basalt columns, with most of the columns with pentagon shaped rock. Dacite’s chemical composition is similar to basalt with a higher amount of feldspar, creating a lighter colour rock. These columns were formed when Giant’s Head Mountain began to re-erupt. Giant’s Head Mountain is a resurgent volcanic dome similar to Mount St. Helen’s. The volcanic lava (magma) slowly cooled, creating the pentagon shapes. There is no direct roadway to the dacite columns. The columns are just north of the Summerland Public Works yard. The dacite columns can be seen if one imagines Lenzi Road continuing directly to the western slopes of Giant’s Head Mountain.

Shown is the dacite columns on the western slope of Giant’s Head Mountain in Summerland with Dr. David Gregory of Summerland