From The Earth Story Facebook:
While it certainly looks as though someone has taken a great deal of paint to these hills, these colours in fact formed naturally.
This unique geological formation is known as the Zhangye Danxia landform, found in southern China. It was formed by sediments laid down in a low-elevation fault basin during the Cretaceous period, which then experienced uplift due to their position on top of various fault zones. The various colours are a result of the erosion of the thick-bedded red sandstone and conglomerate: from running water erosion, biological effect, chemical precipitation and organic staining.
Mississippi River meander maps
Harold N. Fisk, 1944. Geological Investigation of the Alluvial Valley of the Lower Mississippi River.
Army Corps of Engineers: http://lmvmapping.erdc.usace.army.mil/
“a | This is a painting by John Piper that was used as the frontispiece for Waddington’s book Organisers and Genes. In the picture, which is intended to represent the epigenetic landscape, the developmental pathways that could be taken by each cell of the embryo are metaphorically represented by the path taken by water as it flows down the valleys. The water is supposed to be flowing away from the viewer, towards the sea in the distance. But the bifurcations of the valleys look so unnatural that the flow of water actually appears to be towards the viewer. b | A later depiction of the epigenetic landscape. The ball represents a cell, and the bifurcating system of valleys represents the ‘chreodes’ or bundles of trajectories in state space. c | A rare view behind the scenes of Waddington’s landscape. Each valley in the landscape is formed by tension on guy ropes that are attached to complexes of ‘genes’, represented as pegs stuck in the ground. Panel a reproduced with permission from the frontispiece of Ref. 12 © (1940) Cambridge University Press; panels b,c reproduced with permission from Ref. 13© (1957) Geo Allen & Unwin.”
*the permissions quoted above refer to the Nature article, not this post