The study of geologic structures has been of prime importance in economic geology, both petroleum geology and mining geology. Folded and faulted rock strata commonly form traps for the accumulation and concentration of fluids such as petroleum and natural gas. Faulted and structurally complex areas are notable as permeable zones for hydrothermal fluids and the fractures in structurally complex areas. These structurally fravtured and faulted zones often occur in association with intrusive igneous rocks. Theyoften also occur around geologic reef complexes and collapse features such as ancient sinkholes. Desposits of gold, silver, copper, lead, zinc, and other metals, are commonly located in structually complex areas. This book is a comprehensive, up-to-date textbook on the constantly changing and often complex world of this subject.