Figure 1. First and second upper molars of Spermophilus variegatus (UMMZ 89994) at 20X demonstrate the dental anatomy of squirrel molars. Anterior is to the left, lingual is down. The protoloph and metaloph are major transverse crests on the upper molars of sciurids. Dental microwear was documented in an area 0.30 mm by 0.30 mm on the metaconule of the M2 for specimens of modern taxa and the metaconule of the M1 or M2 for fossils. For one specimen of fossil Eutamias, an M3 was used.
