The rock found in our pit orginally came from North of Stuart Lake on a glacier and traveled here possibly when the Cordilleran Ice Sheet melted, which covered most of the what is now called the West Coast, during the Winconsin Glaciation period.
The rock is suspected to have been frozen in the ice and during the process that glacier was somehow stuck in the hills where the pit it today, hence why the present day gravel pit is almost 65 feet deep.