Journey to the depths of the Grand Canyon with geology professor Shawn Willsey as he explores the outstanding exposures of Blacktail Canyon where the Great Unconformity is vividly displayed. Learn the significance of this impressive geologic feature.

00:00 intro, location
00:17 intro to Blacktail Canyon
01:25 Tapeats Sandstone
02:45 Vishnu Schist and Zoroaster Granite
03:27 The Great Unconformity
08:43 mouth of canyon, river, views, outro

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Shawn Willsey
College of Southern Idaho
315 Falls Avenue
Twin Falls, ID 83303