Somehow we got off onto evaporites. If you really envision these as
subaerial evaporative deposits, where do you get the vast amount of NaCl,
or CaSO4, or other salts? Why are they separate, instead of in a mixture
such as we find in the ocean today? To make the great gypsum deposits, or
trona layers, you would have to have very large lakes of very saline water
evaporating largely undisturbed for many centuries. Is this realistic?
K