You show a picture of the erosion of the limestone walls of the Sphinx quarry to a geologist, without him/her knowing where the picture was taken, and nine times out of ten, they will tell you it's rainfall erosion.
I see limestone rain-erosion like that all over the hill country of central Texas, when it rains, it erodes down vertically, cutting vertical runoff drainages in the exposed limestone strata.
I see limestone rain-erosion like that all over the hill country of central Texas, when it rains, it erodes down vertically, cutting vertical runoff drainages in the exposed limestone strata.