300 million year old iron screw

In the summer of 1998, Russian scientists who were investigating an area 300 th km southwest of Moscow on the remains of a meteorite, discovered a piece of rock which enclosed an iron screw. Geologists estimate that the age of the rock is 300-320 million years.

At that time there were not only intelligent life forms on earth, not even dinosaurs. The screw which is clearly visible in the head and nut, has a length of about cm and a diameter of about three millimeters.