Excerpt from Bulletins of American Paleontology, 1961, Vol. 43 Anticosti, Ontario, Manitoba, Vermont, New York, Pennsylvania, Virginia, Alabama, Indiana, Ohio, Kentucky, Missouri, Tennessee, New Mexico, Colorado, Wyoming, Nevada, and Alaska. They have been described from the Ordovician of China, Manchuria, Korea (not from Japan), Siberia, the Urals, and the Baltic area. In the regions mentioned the Ordovician stromatoporoids are isolated or occur in great layers or biostromes. In a few places, as in Vermont and New York, they made reefs or bio'herms. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.