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RE: Concretions and dinosaur bones

The principle is pretty much the same for concretions around
invertebrates: localized microenvironment caused by the decay of organic
material. Some references are in my paper on bacteria role in

Kenneth Carpenter, Ph.D.
Curator of Lower Vertebrate Paleontology/
Chief Preparator
Department of Earth Sciences
Denver Museum of Nature & Science
2001 Colorado Blvd.
Denver, CO 80205
Phone: 303-370-6392
Fax: 303-331-6492

for PDFs of some of my publications, as well as information of the Cedar
Mountain Project: 

-----Original Message-----
From: owner-dinosaur@usc.edu [mailto:owner-dinosaur@usc.edu] On Behalf
Of Robert Simon
Sent: Wednesday, March 15, 2006 12:55 PM
To: dinosaur@usc.edu
Subject: 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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