The interval between the Carboniferous and Jurassic eras is marked by major changes in the structure and character of the Earth and is associated with massive earthquakes, volcanic activity, and large-scale changes of life at the Permian-Triassic and the Triassic-Jurassic boundaries. In this volume, an international assemblage of geologists reveals a wide range of information about these events in the circum-Pacific region, as a conclusion to International Geological Correlation Programme Project 272. They explore the nature of the changes in the Late Paleozoic and Early Mesozoic, and suggest issues for future investigation through the study of paleontology, biostratigraphy, tectonics, magmatic and volcanic development, ore deposition, paleography and climate. As the circum-Pacific region becomes increasingly important for hydrocarbon and mineral exploration, this book will be an invaluable resource for researchers and students in stratigraphy and paleontology.