What are fossils?
Fossils are traces of plants, animals, fishes, and other organisms from the remote past.
Scientists have learned that rocks are stacked in layers containing fossils with the oldest fossils at the deepest layers, and the youngest, or most recent fossils, near the top.
This location-based question is about Fossils in different places around the world.
To start, read the question and try answering it. For more explanations click on the points on the interactive map.
There are many fossils of marine animals, such as clams, fish and corals, in the Limestone A layer of the Grand Canyon. What happened millions of years ago that explains why such fossils are found there? (PISA 2006).