Middle Devonian Coral: Hexagonaria

Here is a Hexagonaria coral from Devonian period. It was found in Louisville, Kentucky.

Blue Fossils of Lake Cumberland Kentucky

The fossils of Lake Cumberland, Kentucky that have a blue color. Three of these pictures have blue crinoid stem pieces and the fourth is part of blue brachiopod shell.

I need to find a source to describe maybe what species these are and why they are this blue color.

Rostroconch Imprint - Louisville, Kentucky

I think these are imprints of rostroconch creatures in Jeffersonville Limestone found in Louisville, Kentucky. The white material might be what is left of their shells or part of the material that made the mode. I found two pieces next to each other but they do not seem to fit together. A heavy piece of earth moving machinery crushed this rock so it is hard to say what it fully looked like.

The rostroconch I have seen found in this area are called Hippocardia cuneus (Conrad, 1840).