Excerpt from Isogeotherm Hypothesis of Mineral Occurrence and Origin: The Origin of Petroleum, Coal, and Other Carbonaceous Products Manner, also limestones of like type. And that many. Perhaps most of our mineral. And non-min eral earth products have a closer relationship to each other. Than has heen supposed. Most, if not all, of the metallic minerals seem to occur in hori zons independently of the stratification. That represent former isogeotherms; hut they do not necessarily occur in their zones of former fusion or volatilization; for instance. Certain carhonate iron ores of a certain type occur numerously in. And seem to he confined to, the coal horizons. They may he said to he of purely chemical origin. Hnt it seems that they required a certain degree of heat in order to enahle their constituents to comhine. 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.