BK11 Field Guide to North American Fossils – National Audubon Society by Ida Thompson –  The first all-photographic field guide. Each of the 474 identification pictures is a full-color photograph of a fossils, sponges, corals, trilobites, shells, teeth, bones and many other types are represented.  Also included are 33 color photographs of fossil-bearing rocks and outcrop formations plus 15 maps. More than 700 fossils are covered, 420 of them in full detail!