Unconformity Types
5:05
Law of Original Horizontality
12:44
Understanding Plate Tectonics
19:54
Geology 101 with Willsey, Episode #18: Unconformities (or Erosion Happens)
10:57
What Are Rocks and How Do They Form? Crash Course Geography #18
11:31
When a Billion Years Disappeared
5:54
Geology: What Is An Unconformity?
22:34
Rock Identification with Willsey: Intro to rock types and useful ID tips
17:58