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reas of southern Nevada, Utah, and Colorado form a loose northern boundary, while the southern edge is defined by the Colorado and Little Colorado Rivers in Arizona and the Rio Puerco and Rio Grande in New Mexico. Structures and other evidence of Ancestral Puebloan culture have been found extending east onto the American Great Plains, in areas near the Cimarron and Pecos Rivers and in the Galisteo Basin. A map of Ancestral Puebloan sites in the Four Corners area Major Ancestral Puebloan sites in the Four Corners area Terrain and resources within this large region vary greatly. The plateau regions have high elevations ranging from 4,500 to 8,500 feet (1,400 to 2,600 m). Extensive horizontal mesas are capped by sedimentary formations and support woodlands of junipers, pinon, and ponderosa pines, each favoring different elevations. Wind and water erosion have created steep-walled canyons, and sculpted windows and bridges out of the sandstone l andscape. In areas where resistant strata (sedimentary rock layers), such as sandstone or limestone, overlie more easily eroded strata such as shale, rock overhangs formed. The Ancestral Puebloans favored building under such overhangs for shelters and defensive building sites. All areas of the Ancestral Puebloan homeland suffered from periods of drought, and wind and water erosion. Summer rains could be unreliable and often arrived as destructive thunderstorms. While the amount of winter snowfall varied greatly, the Ancestral Puebloans depended on the snow for most of their water. Snow melt allowed the germination of seeds, both wild and cultivated, in the spring. Where sandstone layers overlay shale, snow melt could accumulate and create seeps and springs, which the Ancestral Puebloans used as water sources. Snow also fed the smaller, more predictable tributaries, such as the Chinle, Animas, Jemez, and Taos Rivers. The larger rivers were less directly important to the ancient cultu re, as smaller streams were m