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One of the most famous dinosaur fossils is named Sue. Sue is a
Tyrannosaurus rex
. When Sue died, about 66 million years ago, she might
have fallen into a swamp. Soon after that, she was completely buried in
mud. Over a period of thousands of years, her bones were replaced with
minerals. As the mud around her turned into
sedimentary rock
, her
bones became
petrified
, and turned into stone.
This is what Sue’s bones looked like when she was found in South
Dakota.
A scientist puts plaster over Sue’s bones in preparation
for transportation to the lab.
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