The Mesozoic and Cenozoic Echinodermata of the United States is a scientific book written by William Bullock Clark and published in 1915. The book is a comprehensive study of the echinoderm fossils found in the United States during the Mesozoic and Cenozoic eras. It includes detailed descriptions and illustrations of various species of echinoderms, such as sea urchins, starfish, and crinoids, and their evolution over time. The book also explores the...