For a two element ionic compound, the naming is simple. The first part of the name is the name of the metal element. The second part is the name of the nonmetal element, with the suffix â-ide.â. 1  Example: Al 2 O 3.
Exploration & Excavation in Chaco Canyon. It's believed that the first Europeans to see Chaco Canyon came in the 17th Century, when Spanish soldiers engaged in military actions against the Navajos first entered the Chaco area.
By 1921, when the National Geographic Society Expedition began work at Chaco Canyon, several new archaeological techniques came into use. The first was stratigraphy, the principle that unless there is evidence of disturbance in deposited layers, material found in lower layers is older than that above it.