The Billings Gazette has three short videos on the geology of the Billings, Montana area featuring Rocky Mountain College geology professor Derek Sjostrom: Geology of the Beartooths -- Montana's highest mountain range (Granite Peak, 12799 ft, 3902 m) has a core of 3.2 billion year old metamorphic rocks. Geology of the Pryors -- The Pryor …
GeoChristian 