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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