Published by San Diego Geological Society and distributed by Sunbelt Publications -- San Luis Rey on Display Geoscience in Northern San Diego County is a guidebook and collection of papers prepared to accompany San Diego Association of Geologists" (SDAG) 2013 annual field trip. Use the road log with route map for insights on the geology, paleontology, and archeology in the heart of this 50+ mile long watershed. Travel east from Interstate 15 along California Highway 76 to Lake Henshaw, with a loop through Palomar Mountain. A regional geologic map illustrates the San Luis Rey River drainage basin. Papers provide depth on a cross section of geoscientific subjects.