Fossils can be found all over the world, often in layered rock formations. To determine the age of the rock layers within an area, geologists and paleontologists use a technique called radiometric dating. Determining the age of a rock layer allows
scientists to determine the age of the fossils within it.
Some of the more exciting fossil discoveries are of dinosaurs, which existed on Earth between 230 and 65 million years
ago. Examine this map e. Click the map to zoom in, and drag the magnifying glass for a closer look. The map shows
where prehistoric rocks formed during the Triassic, Jurassic, and Crustaceous time periods, the same periods when
dinosaurs walked on Earth. Based on the map, what is the closest location to you where dinosaurs are likely to have lived?