Mazon Creek Fossil Plant Concretions

300,000,000 years ago, in the Carboniferous period, Earth was a dense tropical jungle. Lush forests were home to all manner of prehistoric creatures and swampy landscapes covered the surface. We know of this incredible time thanks to the fossil imprints left behind by plants that were preserved for millions of years.

This specimen is a split pair fossil plant concretion that was recovered from Mazon Creek in Illinois. This former coal mine turned fossil site is the perfect place to find highly detailed fossils from the Carboniferous, as much of the coal beds we have today were formed during that time. These fossils come as a paired set, which you can open to reveal a beautifully detailed imprint of the ancient plant on either side.