This book presents an innovative methodology to depict the complex geologic data of a region on a single map. The author, a leading expert in the field of geologic mapping, presents a structured approach to representing three-dimensional lithostratigraphic data using a combination of colors and line and dot patterns. The technique goes beyond traditional mapping methods by considering geologic materials not only across the land surface but also in layered sequences below the surface. By combining diverse geologic information into a single, visually appealing map, the book provides a powerful tool for understanding the complex relationships between geologic materials and their spatial distribution. The author draws on examples from a regional study in the United States to illustrate the methodology, making this book a valuable resource for geologists, environmental scientists, and land-use planners seeking to convey complex geologic data in a clear and accessible manner.