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.
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhX72yG3ObXKUtKfI8bu4gd4lHQMLXGP1SbTlem-5GqbgqpHdFScsBKfl-__akHjyrikz6ZbfqfQ9xWsureUKIWNnPR2PfzmggGKWbmlW3bLDSYc-jp4YO5z5nsDSAXbN-ZWCDn9lPqs0Hf/s400/sponge2.jpg)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjmONt8KUSbqjivVLjlt573GYGng9sW6yXLvn49RARsN1FksRfJS-hjKcf0KeRaLbxQT25k_K4dQGegKFZ5iBWzoBxAPew9ukVD7HotDfBXXE_s_SkuS8xj1BPJgyDQ9x-vk9OS2t0T8_VT/s400/sponge4.jpg)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh_sV8hVjeE0nwirU7f8XF62LJpTssGUAaRaX5dl-QezGQfao18DCoryjeR75YLLn_cFjCcXMwVgKkgjuIrMQ3JX0dI9Qn1G-nSM_7UNXbK-QIM4_joCvksqo0Pz6rlDK5RkS0wNAIE6MBL/s400/pancake-fossil2.jpg)
UPDATE: This fossil is a mounding stromatoporoid or calcareous sponge. It probably lived in the Silurian period.