Houses at Muir were small and square to rectangular in shape, with single-set posts placed along the edges of shallow basins. The houses ranged in size from 9 by 11 feet to 14 by 14 feet. Inside each one was a small, central hearth. An arrangement of interior posts within one house suggested that a bench or partition had once been inside. There was very little evidence to suggest that Native residents had used these houses for anything other than sleeping or perhaps for storage. After moving to newly constructed houses, residents used some of their former houses as trash dumps.
Ceramic vessels were cordmarked or plain-surfaced jars. Vessel neck decoration consisted of rising and descending incised lines. The classic Fort Ancient jar decoration - incised curvilinear "guilloche" designs (interlaced or overlapping curved or wavy lines) - was rare. Jars most often had thick, parallel-sided strap handles, but a unique form of handle from Muir was a strongly angled form that looked like an "elbow." A pair of “ear-like” projections were located on the jar lip, directly above the handle.
The Muir site produced an abundance of animal and plant remains. Deer, elk, and bear accounted for almost 90 percent of the meat eaten by the site inhabitants. A variety of other mammals - beaver, raccoon, gray fox, dog, gray squirrel, woodchuck, otter, bobcat, and opossum - were eaten, too. Turkey represented almost all the bird remains.
Muir site residents ate both cultivated and wild plants. Corn was the main crop they grew in their agricultural fields, although they also grew beans and native cultigens, such as erect knotweed and sunflower. Black walnuts and hickory nuts were the primary wild plants collected and eaten by the Muir site residents.