Pancake or Paper Layer Fossil

This fossil reminds me of stacks of pancakes or layers of paper. I am not sure if it is a coral or a sponge. It was found in a Devonian fossil area in Louisville, Kentucky.

UPDATE: This fossil is a mounding stromatoporoid or calcareous sponge. It probably lived in the Silurian period.

Silicified Devonian Horn Coral

Here is an unidentified horn coral that was found in a Devonian area. It sparkles quite a bit in the sun so maybe it is quartz or calcite. Found in Louisville, Kentucky.

Brachiopod Replaced with Quartz/Calcite

Here is some Devonian rock with a brachiopod cavity filled with quartz or calcite.

It was found in Louisville, Kentucky.