Broadcast Outage: We're investigating a broadcast transmission failure affecting the San Luis Valley from Antonito in the south to Salida in the north. We're working to resolve this issue. You can stream our live broadcast HERE or via the RMPBS+ App.

Stream live and on-demand content now on our new app:
RMPBS+

Help tell more stories in 2026 - make a year-end gift!

Give Now
Doug's Geology Journal show's poster
Science and Nature
Doug's Geology Journal

An Army of Caterpillars

Field geologist and host Doug Prose helps make sense of complicated geologic stories. By sharing his observations in places as diverse as Iceland and Death Valley, Doug explains big-picture geologic processes that shape the landscape. This series is sure to inspire interest in not only the geology around us, but the amazing stories that are shaped by planet Earth.

RMPBS Passport

Please log in to your PBS Passport account to watch this video

Become a Member

An Army of Caterpillars

Season 1 Episode 103 | 26m 46s | CC

The Basin and Range geologic province is where the Earth’s crust has been raised up and stretched and broken apart into parallel blocks of rock, creating a repeating series of rugged mountain ranges with valleys between them. Doug descends into California's Death Valley and climbs high into the wilderness mountain ranges of Nevada, before descending into another far-flung basin.

Doug's Geology Journal

Watch more episodes

See more
See more
Distributed nationally by American Public Television

Subscribe to Our Newsletters

Get trusted Colorado stories, programs, and events from Rocky Mountain PBS straight to your inbox.

Set Your Preferences >