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At 09:54 AM 4/6/99 -0500, King, Norm wrote:
>The claystones of the Morrison are not really aquatic deposits. They may
>have been deposited on river flood plains, but the setting was terrestrial.
>In addition, many of them are paleosols, reflecting pedogenic processes more
>than original depositional conditions.
Having seen part of the Morrison in person, I can say that this certainly
matches my impression. In fact the outcrop I am familiar with is almost
entirely paleosol in my estimation, with only a few thin channel/crevasse
sand bodies near the lower part of the outcrop. Since I was within a mile
or two of the Morrison type locality, I suspect this is fairly typical.
[I really pulled a joke on myself there too - I found an in-situ dinosaur
bone, and thought it was fossil wood for several minutes].
> The limy deposits I am familiar with
>formed on shallow lake beds, and they were often hypersaline, complete with
Another *possible* source for limey deposits in a semi-arid zone like, the
Morrison area 130 MYa, is caliche, that is pedogenic processes. I cannot
say that such exists in the Morrison, but it would not surprise me if it did.
May the peace of God be with you. firstname.lastname@example.org