More of a reference work, the preface gives a very up-to-date breakdown of earth's geologic periods, linking them to the ages of flora and fauna that we all know.
Each of the 101 sites listed has a page of text and a page of pictures/maps/charts. Each describes a part of the history of this continent, from inland seas to glacial folds to volcanic flows. The information is very accessible, and a map leads to each of the sites.