If you are near the Louisville, Kentucky area this weekend (November 12-24, 2010) consider visiting the KYANA Geological Society Mineral,...

Stay with my theme this week of crystals and brachiopods... Calcite crystals formed in Athyris brachiopods of the Middle Silurian Period....

This image shows a crystal lophophore probably belonging to a Pseudoatrypa brachiopod.  The fossil is broken at least in half leaving a v...