man english dating sites great britain - Age dating of fossils
It includes an example of a running dinosaur that left tracks with an 8-foot (2.4-meter) space between the right and left prints; from these prints, scientists calculated that the dinosaur ran at speeds of 14.5 miles (23.3 kilometers) per hour one of the faster dinosaurs known.
Similar to the fossil formation of hard parts, the footprints and tunnels were filled in by sediment, then buried by layers of more sediment over millions of years, eventually solidifying.
Today we see the results of this long-ago activity as trace fossils.
There is a difference between tracks and trails, too: tracks are generally the traces of distinct footprints, whereas trails may have been produced by an animal dragging its feet or some other appendage as it moved.
Tracks, therefore, are more distinctive, and different animals can be distinguished by their own particular footprints.
Trace fossils are just that: the traces of a creature left behind, usually in soft sediment like sand or mud.