Found in Concretions
This material is almost always against or near
Arthrodire
bones found
within concretions. The same can not be said for bone fossils found
in a shale matrix. It has an appearance and texture of wood.
These samples range in widths of 3/4 inch and
less.
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This is a 150X magnification of a cross section.
There are 5 separate layers of significantly different looking
materials.
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