Video Recording: Bicycle Geology of Mount Diablo

October 7, 2020

Photo Credit:

John Karachewski


John Karachewski, a geologist, hiker, bike rider and photographer will take you on a ride up Northgate and Summit Roads to see over 200 million years of geological history. Your front-seat journey takes you from ancient lava flows erupted on the seafloor thousands of miles away to modern landslides as you learn how Mount Diablo became the prominent natural landmark of Northern California.




John Karachewski

© 2021 by Mount Diablo Interpretive Association