USGS map, Prescott sheet, 1892
Ten miles west of Juniper P.O. near lat. 34° 54', long 112° 58'. In Santa Maria mountains east of Baca grant, west side Williamson valley, which Wheeler called "Val de Chino." "From a fancy founded on the evident antiquity of the ruins, we have given the name Aztec Pass, to this place." Wheeler, Jan. 23, 1853.