Why are dinosaurs buried so deep? Did rock form over them?
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The earth is old. Really really old. You might think your great aunt Cathy is old, but the earth is WAY older than Cathy. Not hundreds or thousands of years old, but billions of years old. The dinosaurs evolved about 250 million years ago, and went largely extinct about 70 million years ago. Since that time, continents have moved, ice ages have been and gone, mountains have formed, rivers have deposited kilometres of sediment. Dinosaur bones have been buried by millions of years worth of erosion, deposition, sedimentation. Sometimes the rock they are in got bent upward, or been brought to the surface by rocks shifting and cracking. We can find those bones relatively close to the surface. There are many more bones buries so deep we will never find them.
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