Archaeology in Tucson volunteers survey more than 2 1/2 square miles in Catalina State Park, north of Tucson. Twenty-nine new sites are recorded, and additional information is collected from thirteen previously known sites. In the mid-1800s, Francisco Romero built stone-walled ranch buildings atop an ancient Hohokam village. Now known as Romero Ruin, this prehistoric site was founded between A.D. 200–450, and reached its peak occupation between A.D. 800–1000. The remains of the historic ranch and the Hohokam village are within state park boundaries.