8:15
Jasper Knob, Ishpeming, Michigan
Michigan Rocks
16:42
Mystery Valley - Come explore earth cracks, sinkholes, and creepy algae covered trees.
14:55
El Cajon Bay Karst Formations
15:59
An Underwater Sinkhole, a Giant Gowganda Tillite, Puddingstones, and Petoskey Stones
7:00
Sea Stacks of St. Ignace
20:52
90 Foot Deep Underwater Sinkhole
10:53
Twin Sinkholes!
10:08
Mystery Valley in the Spring
24:07
Learn to Identify Lake Huron Rocks with Two Geologists
33:25
Learn Rock Identification with Two Geologists
