A New History of Life

Begin the story of life on Earth with an overview of the unifying idea that will govern your exploration. Called Earth system science, this approach views Earth as an integrated network comprising the lithosphere, hydrosphere, atmosphere, and biosphere. Sample the complex interactions between these realms.

How was the great antiquity of Earth discovered? Survey the observations that led to the concept of deep time and, in the process, developed the tools that can read the story in rocks. End with a striking analogy that puts human time into perspective.

Delve into biostratigraphy, the study of fossil sequences in rock strata. The discovery that different layers of rock are characterized by distinctive fossils solved the problem of correlating sedimentary strata from different regions. This led to the geological time scale, initiating a revolution in Earth science.

Learn how paleontologists interpret fossils to reconstruct the traits and environments of extinct life forms. Examine some of the pitfalls of the field, including cultural biases that can lead to doubtful conclusions, such as that Tyrannosaurus rex was as terrible as depicted in the movies.

The history of science is marked by ideas that were before their time. One of the most important was Alfred Wegener's concept of continental drift, which was revived in the theory of plate tectonics. Explore the role that fossils played in this original grand unifying theory of geology.

Turn back the clock to Earth's earliest epoch, focusing on these questions: How did the solar system form and why do we live on a layered, differentiated planet? What do these events and the formation of the moon have to do with the evolution and development of life on Earth?