Tricky
Briefly immortal
LOL. You propose supernatural origins, but you find geologic explanations implausible? Are you immune to irony?So far the only explination that is slightly plausible for any of the formations is the "mud crack" theory for the polygons .
This falls apart when the cracks decend vertically.
BTW, if the "cracks" Zep describes are indeed a result of clay shrinkage (i.e. mud), it doesn not necessarily mean they are shallow. The rocks contain lots of clay minerals throughout the matrix. Shrinkage may occur uniformly within the rocks, sending the cracks very deep. Another word for this is "jointing". No, it is not like the "jointing" you do at one of your parties.