The main difference between the Basketmaker midden circle and the Apache mescal pit is that the true mescal pit or earth oven is a depression definitely sunk below the ground level, whereas the midden circle is on ground level. Consequently, the midden circle had other uses than the preparation of mescal hearts. There are three types of midden circles. The most common is the circular mound, which is found up to an altitude of 7500 feet, and out considerable distances into the flats. It is of interest to note that no midden circles of the Carlsbad Basketmakers are found east of the Pecos River. The circular ones will average from 30 to 35 feet in diameter in this area. “The first stage (of development) seems to have begun with the construction of a fireplace composed of fairly large rocks. When heat had cracked these into fragments too small to be useful, the broken bits were then cleared away from a circle about the fire and the hearth rebuilt with other large stones, which in turn were discarded when broken down by heat. When this process had been repeated many times, the cleared circle immediately around the fire was surrounded by a ring formed by an accumulation of the rejected small stones. In course of time and with constant additions of ash and discarded rock, the resulting mound grew to such height that it might even have proved serviceable as a wind break. That such a method was employed seems quite probable, because all the stones composing the outer ring show hard firing, while scattered through the mass are found ashes and rejecta of a camp. If this hypothesis is accepted, a large number of these structures would indicate an extended occupation or perhaps repeated occupation over a comparatively long period.” (Mera) [Illustration: _This drawing shows the three stages of development of the midden circle_] The second type is found on ledges or narrow terraces along canyon walls and was elongated in shape. The third is built out in front of caves and shelters and takes on a rough half-circle shape. The mescal pit as used by the Apaches is described in their section. [Illustration: _A Basketmaker Midden Circle or cooking pit_] [Illustration: _A cut-bank showing an elongated Basketmaker Midden in Slaughter Canyon_] Practically all game was hunted, notably mule deer, elk, and buffalo; and next, if not the most important, rabbits, both the cottontail and jackrabbit. Also, antelope, plains white-tail deer, big horn sheep, peccary (Javelina), mountain lion, bobcat, wolf, fox, coyote, badger, porcupine, ring-tailed cat, opossum, prairie dog, armadillo, pack rat, kangaroo-rat, muskrat, field mouse, white-foot mouse, beaver, pocket mouse, ground squirrel, pocket gopher as well as fish, ducks, hawks, owls, quail, desert tortoise, pigeons, doves, large terrapin, lizards, and snakes were utilized.