NOVA Online: Curse of T. rex (see bottom of page for navigation)
Trex sidebar (see bottom of page for navigation)

Yes! Sedimentary rock is the best place to look for dinosaur fossils. Many fossils came from dinosaurs that were covered by sediment soon after they died. The soft parts of a dinosaur (such as skin and organs) quickly rotted, but hard parts (such as teeth and bones) remained. As sediment continued to settle on top and turn to rock, water moving through the rock slowly replaced the chemicals in the bones with hard minerals, creating fossils.

OK, so you need to look for sedimentary rock. But sedimentary rock has been around for millions and millions of years. You need to find the sedimentary rock that formed during the time the dinosaurs lived.

Dinosaurs roamed the Earth between 250 million years ago and 65 million years ago. Geologists divide the Earth's history into sections called eras. Click on the era that spans the time when dinosaurs lived.

Geological eras (see below for navigation)

Precambrian | Paleozoic | Mesozoic | Cenozoic

T. rex Home | Not Alone | Dig | Resources | Table of Contents

Support provided by

For new content
visit the redesigned
NOVA site

NOVA Home | WGBH Home | PBS Home
Search | Feedback | Shop | Printable page
© 1997 WGBH