This whole valley was once full of red hot lava, 100m deep.

The lava all came from the Opal Cone in Garibaldi Park between 10-12k years ago. It stops about a km from my place.

The lava flow gives the Mamquam valley an unusual feature: it divided the valley into two rivers: Ring creek on the north and Skookum Creek on the south (which joins the Mamquam).

Ring creek joins the Mamquam right before the Squamish Golf Course.

Here's the spot near Sookum creek where the lava flow enters the Mamquam valley, the road cut exposed the Columnar jointing.

It similar to Black Tusk but a different rock (dacite I think).