A tour titled "Spring Equinox Tour of Los Mortenos and Picture Rocks Petroglyphs Archaeological Sites" takes place from 8 a.m. to noon, Saturday, March 20. Free. Space is limited and reservations are required. The group will depart from the northeast corner of Silverbell Road and Linda Vista Boulevard., in Marana. Call 798-1201, or e-mail info@oldpueblo.org for more information.