Chilliwack batholith

The Chilliwack batholith is a large batholith that forms much of the North Cascades in southwestern British Columbia, Canada and the U.S. state of Washington. It is part of the Pemberton Volcanic Belt and is the largest mass of exposed intrusive rock in the Cascade Volcanic Arc. The age of the Chilliwack batholith ranges from 26 to 29 million years old.^[1]

References

1. ^ Miocene peralkaline volcanism in west-central British Columbia - Its temporal and plate-tectonics setting