a part of the "Staircase
of Time" showing when the dinosaurs lived. Dinosaurs appeared
on Earth nearly 250 Million years ago, early in a period of time
geologists called Triassic.
They grew in numbers and types during the Jurassic
time period, and dominated Earth during the Cretaceous
time period. Their feet shook the ground for nearly 200 million
years - 40,000 times as long as recorded human history! But then
suddenly they all mysteriously disappeared at the end of the Cretaceous
Period about 65 million years ago. Why? Look in some of the other
rooms and see!