A detailed account of the geology of the Keystone State, based on the findings of the Geological Survey of Pennsylvania in 1886. This book provides a comprehensive overview of the state's geological history, including insights into the formation of its coal deposits, oil and gas reserves, and mineral wealth. Richly illustrated with photographs, maps, and diagrams, this book is an invaluable resource for geologists and historians alike. This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it. This work is in the "public domain in the United States of America, and possibly other nations. Within the United States, you may freely copy and distribute this work, as no entity (individual or corporate) has a copyright on the body of the work. Scholars believe, and we concur, that this work is important enough to be preserved, reproduced, and made generally available to the public. We appreciate your support of the preservation process, and thank you for being an important part of keeping this knowledge alive and relevant.