The Presidio Santa Cruz de Terrenate, a Spanish fort established in 1775 and abandoned by 1780, is one of the most intriguing and evocative sites along the San Pedro River. Relatively few prehistoric and historic sites have been investigated along the San Pedro River, given the area’s rich history. Most of what is known about the early historic inhabitants of the San Pedro comes from Spanish military and church documents, along with the archaeological excavations and publications of Dr. Charles diPeso, who served as director of the Amerind Foundation from 1952 to1982, and more recently by archaeologist Dr. Deni Seymour,...