Baja California is an improbably long and narrow peninsula. It thrusts out like a spear, parting the Mexican mainland from the Pacific Ocean. In his third installment on the Gulf of California's coastal setting, expert geologist and guide Markes E. Johnson reveals a previously unexplored side to the region's five-million-year story beyond the fossil coral reefs, clam banks, and prolific beds of coralline algae vividly described in his earlier books...