The Preclassic period in Maya history stretches from the beginning of permanent village life ca. 1000 B.C. until the advent of the Classic Period ca. 250 AD, and is subdivided into Early (prior to 1000 B.C.), Middle (1000-400 B.C.), and Late (400 B.C.- 250 A.D.). Major archaeological sites of this period include Nakbe, Uaxactun, Seibal, San Bartolo, Cival, and El Mirador in Guatemala; Cahal Pech, and Cerros in Belize; and Calakmul, Yaxnohcah, Ichkabal, Komchen, and Xocnaceh in Mexico.