When dinosaurs walked through the mud they left footprints, just like you do on a muddy trail. Over time these footprints were filled with sand, small pebbles or ash from a volcano and eventually hardened into rock. The footprints were preserved for millions of years until erosion brought them to the surface where people can see them.
It might seem like burying tracks would destroy them, but a blanket of sediment actually helps protect footprints. Another way in which a track can be protected is when an animal's foot sinks deeply into the sediment, creating a footprint below the surface, where it cannot be eroded.
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CREDIT LINKS
► The Vortex Youtube Channel = https://www.youtube.com/c/TheVortex1
► The Vortex Video = https://www.youtube.com/watch?v=kHTc0ZQmSUE
► National Jurassic Youtube Channel = https://www.youtube.com/channel/UCAcDMMIqfYFp-C-YKxuSUzA
► National Jurassic Video = https://www.youtube.com/watch?v=FBwTODl8VRY
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