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Concretions and dinosaur bones

Have there been any papers published on concretions
forming around dinosaur bones? Having prepared many
dinosaur bones from the Morrison formation of Wyoming,
I have noticed patterns. A number of bones are totally
encased in hard siliceous and lime concretions. Often,
the spinal cavites of vertebrae are filled with
exceptionally hard matrix, much harder than the matrix
surrounding the overall bones. There must be chemical
reactions occurring during the fossilization process
that is creating these matrix changes. Also, many
bones are separated from the encapsulating matrix by
rinds of crystalline gypsum. Larger bones have thicker
gypsum rinds. 

Bob Simon

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