Rhabdoderma elegans
Pennsylvanian
Francis Creek Shale
Will Co.
Illinois, USA.

Exceptional Mazon Creek concretion containing the rare prehistoric fish Rhabdoderma elegans, an ancient coelacanth relative dating to the Carboniferous Period, approximately 307 million years ago. Recovered from the famous Mazon Creek fossil beds of Illinois, this specimen preserves a remarkable glimpse into the swampy coastal ecosystems of Paleozoic North America.
47mm coelacanth in 79mm half-concretion. VERY rare!