Is this a 300 million-year-old screw or just a fossilized sea creature? | Ancient Origins

A Russian research team known as the Kosmopoisk Group, which investigates UFOs and paranormal activity, claims to have found a one-inch screw embedded inside a rock that is 300 million years old.

Source: Is this a 300 million-year-old screw or just a fossilized sea creature? | Ancient Origins