| Title | Comment | Keywords |
|---|---|---|
| Angular Unconformity | 18:26 - 19:30 (01:04) / 1.2 MB | "Dee Trent", "angular unconformity", "geologic structure", unconformity, erosion, uplift, "tilted bed", "sea level change", "tectonic activity", deposition, "Principle of Original Horizontality", sandstone, "sea level change", erosion, "sedimentary rock", contact |