Figure 36. Bivariate plot of length versus width of the first lower molars of the rodent Copemys from sites on Fort Polk, Louisiana and from Coldspring, Texas. Three sites on Fort Polk, Stonehenge, Gully, and DISC, crop out in ascending stratigraphic order, and TVOR is probably stratigraphically lower than Stonehenge, although lack of outcrops makes this uncertain.