The descriptive text includes information on size, geological period, geographical distribution, and ecology of the animal or plant before it was fossilized. In addition, the book provides lists of Geological Survey offices and major fossil collections, a geological time chart, and a guide to collecting and preserving fossils.

    You've always wanted to know how the Mississippi River was formed. For years, you have wondered about why shark teeth have been found in the Minnesota's Iron Range or wished that someone would unfold a timeline for the state's 3.5 billion-year history. Wait no longer; your prayers have been answered. University of Minnesota geology professors Ojakangas and Matsch have written a intelligent and entertaining account of this mineral-rich region.

    Advances in geochemistry, geochronology, and geophysics, as well as the appearance of new analytical tools, have all contributed to new ways of thinking about the origin and evolution of magmas, and the processes driving metamorphism. This book is designed to give students a balanced and comprehensive coverage of these new advances, as well as a firm grounding in the classical aspects of igneous and metamorphic petrology. The emphasis throughout is on the processes controlling petrogenesis, but care is taken to present the important descriptive information so crucial to interpretation.One of the most up-to-date synthesis of igneous and metamorphic petrology available. Emphasis throughout on latest experimental and field data. Igneous and metamorphic sections can be used independently if necessary.

    

    

    

    In preparing this book the author interviewed virtually all of the important contributors to that critical decade of research, 1957-66. Working in the tradition of history of science, he explores personal relationships, institutional support, and the rivalries and frictions between and within research groups.