Meteor Crater is a 180 m deep, 1.2 km diameter, bowl-shaped depression on the southern edge of the Colorado Plateau, located in north-central Arizona. During the early 1970s, the USGS conducted a program of rotary drilling on the rim and flanks of Meteor Crater. 161 drill holes were completed (see interactive map below) and over 2,500 m of drill cuttings were collected, spanning the entire extent of the Meteor Crater ejecta blanket.