Archaeologists usually recognize four culture patterns in the Southwest: the Hohokam, Mogollon, Anasazi, and Patayan. Two of these groups, the Cohonina Branch, usually regarded as Patayan, and the Kayenta Branch of the Anasazi, were in contact along the southern side of the Grand Canyon. While the Cohonina specifically, and the Patayan culture pattern generally, are not yet clearly defined, certain differences between them and the neighboring Kayenta Branch Anasazi are apparent. The Cohonina finished their pottery by use of the paddle and anvil, instead of scraping and polishing it as the Anasazi did; both groups, however, used a reducing atmosphere for firing, which produced a gray ware. In architecture, the Anasazi were generally more advanced. Cohonina sites usually consist of scattered surface houses, often with ramadas nearby. The Anasazi lived mostly in permanent villages of pithouses and later surface structures of true masonry, and in distinction to their western neighbors, they built ceremonial rooms. In the making of stone and bone tools, as in architecture, the Anasazi were more advanced and produced a greater variety of tool types.