Fossils are some of the Earth’s most useful prehistoric remnants, giving us a window to the daily life of creatures which lived millions of years ago. It has become a common sight to see popular fossils such as those of Stegosaurus and Tyrannosaurus Rex in museums, but what is much less known are the many strange and bizarre fossils which paleontologists have discovered, especially recently. These fossils have been kept – whether by ash or amber or sand – in a state clear enough for us to study and learn from.
Fossilization is a complicated and time-consuming process. It normally happens when sediments are compacted under intense pressure combined with the replacement of organic matter by silica and other materials in a process referred to as petrification. Since most tissue, including skin, organs, and muscle, decays before full fossilization can occur, we mostly find bones. Though there are plenty of bones on this list, we’ve also included a host of other bizarre fossils. (Did someone say fossilized sperm? Oh, we did.) You’ll likely be shocked at some of the weird fossils on this list; ones that unfortunately don’t get as much media attention as they should, such as a turtle the size of a helicopter and an ancient arthropod orgy. Read on to discover the 25 Most Bizarre Fossils Ever Discovered.