This SEPM/PS-SEPM volume celebrates the life and scientific achievements of Donn S. Gorsline focusing on the California Continental Borderland, a region where Donn worked extensively. The 18 papers in this volume span offshore Borderland basin settings and exposures in onshore, inner Borderland regions affected by tectonic uplift. They touch on aspects of sedimentation in the modern source-to-sink sedimentary systems, encompassing some world-class Miocene to Pleistocene outcrops and the subsurface distribution of submarine fan and hemipelagic facies, as well as the structural evolution of the Borderland basins and their associated magmatic components. The broad topics covered will be of interest to a spectrum of geologists and geophysicists interested in transtensional to transpressional basin settings, the Cenozoic tectonic evolution of southern California, models of deep-marine to coastal depositional systems, as well as regional hydrocarbon exploration. Additionally, the geologic history and structure of the California Continental Borderland are connected with the distribution of modern seafloor life and marine ecosystems. This volume serves as a benchmark of current research in the region with the aim of spurring future exploration and study.