Mined from: Illinois, USA

Era: Paleozoic
Geological Age:  Approximately 488 to 252 mya

Description: This Horn Coral fossil from Illinois, USA is a striking remnant of prehistoric marine life that thrived during the Paleozoic Era, spanning approximately 488 to 252 million years ago. Belonging to the now-extinct Rugosa order, horn corals are known for their distinctive cone-shaped skeletons and radial internal structure. These solitary corals once lived on shallow seafloors, extending their tentacles to catch plankton in ancient inland seas that covered much of North America during this vast span of Paleozoic time.

Fossils like this are commonly found in the sedimentary layers of the Illinois Basin, a region rich in Paleozoic marine deposits. The mineralized remains offer a glimpse into early reef-building life long before dinosaurs roamed the Earth. With their fossilized ridges and natural symmetry, horn corals are both scientifically significant and visually intriguing—perfect for collectors, educators, or anyone fascinated by Earth’s deep past.

Approximate Size of 1 piece: 15mm x 14mm x 8mm
Approximate Weight of 1 piece: 2g

Quantity: 1pc

We do our best to buy quality products- although not every rock is the same. If you choose to purchase the "staff pick option", we will select the best of the batch for you. Otherwise, it will be at random from the larger batch we have in stock.