Revision of a book widely used by amateur paleontologists since 1958. 377 p. Highly readable account of the history of animals with backbones. Basic college-level text from which to learn about fossils of animals without backbones. 342 p. Introduction to the world of microfossils. Well illustrated textbook dealing with our planet and its life through time.
Many fossils are too small to be studied without a microscope.
The limestone is made up of the shells of Cambrian fossils.