All
These rocks look suspiciously like dolomite (yellow) and maybe gypsum
(grey)? The structures could then be 'enterolithic' folds due to the
~40% volume increase as original anhydrite recrystallises to gypsum? See
http://www.newark.osu.edu/facultystaff/personal/jstjohn/Documents/Rocks-and-Fossils-in-the-Field/Gypsum-Plain.htm
for pictures of the classic Castile Formation structures (Permian, west
Texas & New Mexico).
Nigel Woodcock
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