Existing comment:
Preservation
The dinosaur tracks are quite delicate. Even though they are made of rock, they can break and are subject to vandalism. Below is a picture of the same hadrosaur track in 2010 and then in 2011. By 2011, someone had broken off a piece of the track and removed it from the area. Through this careless act, a once great record of the past is lost forever.
How These Tracks are Formed
As the dinosaurs walked through the mud they left footprints. These footprints would eventually fill with pebbles and sand, and over time harden into rock. Over millions of years erosion brings these rocks to the surface where we can see them today. |