Layers of resistant porcellanite rock interleaved with less resistant chalk that forms the eroded recesses. In this area, silt has sifted down from above covering many of the individual ledges formed by the differential erosion of the two rock types.
Photo Location: Alvin Canyon, east wall 1088-1010m
Photo Date: 20130718T172950Z
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| Added On | 17th October 2015 |
| Viewed | 4 viewed |