Thank you! I couldn't figure out how the hematite/metallic replacement matrix figured in. My familiarity is with the Coon Creek fossils and of course, there, the actual late Cretaceous animal was preserved.
Lin
On Thu, Aug 9, 2012 at 10:55 PM, mstreman53 <mstreman53@yahoo.com> wrote:
If it were a crinoid, then perhaps it is the holdfast rather than the calyx.
The over all impression of the "mineral" is specular hematite. I don"t recall seeing hematite replacement on that scale. It does occur in ordovician/slurian sandstones, limestones, and marbles here in Tennessee. A streak or specific gravity test should confirm if the matirx is hematite.
Elton
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