This monograph contains over fifty high-quality plates of electron micrographs of limestones. It spans the field of limestones in age from Cambrian to Recent, and in type from deep-sea oozes to intertidal rocks. It represents the outcome of four years of research in the new field of electron microscopy applied to rocks. The illustrations show the spectacular results and much more is revealed in fossils and textures than would be expected on the basis of optical studies. Originally published in 1967. The Princeton Legacy Library uses the latest print-on-demand technology to again make available previously out-of-print books from the distinguished backlist of Princeton University Press. These editions preserve the original texts of these important books while presenting them in durable paperback and hardcover editions. The goal of the Princeton Legacy Library is to vastly increase access to the rich scholarly heritage found in the thousands of books published by Princeton University Press since its founding in 1905.