Milwaukee County’s Geologic History and Setting

This chapter delves into the extensive and interconnected field of geology, a fundamental branch of natural history that has evolved over three centuries. The chapter emphasizes historical geology, which integrates findings from paleontology, stratigraphy, petrology, and geochronology to chronicle Earth's 4.54 billion-year history. The geologists' quest to understand the past through rock units and structures is encapsulated in the geologic time scale. The chapter also emphasizes the significance of various geologic periods, particularly the Silurian and Devonian, which shaped Milwaukee County's bedrock and landscapes. By examining the contributions of early geologists and the transformative theories of plate tectonics, the chapter provides a comprehensive view of Earth's dynamic history and its implications for architectural geology in Milwaukee.