William S. Logan

William S. Logan was an influential American geologist and pioneering figure in geological science during the 19th century. He is best known for his work in mapping and understanding the geology of California and the western United States. Logan's research contributed significantly to the field by helping to clarify geological formations and mineral resources, which was essential during the gold rush era. His detailed surveys and studies laid the groundwork for future geological exploration and mineral development, earning him recognition as a key figure in the advancement of geology in America.