FIGURE 2. Occlusal surface of an isolated tooth of hadrosaurid (SEM images of cast of AMNH 21700) illustrating the difficulties of cleaning with brush and solvent (ethanol). 2.1 Low magnification image showing full width of tooth, at this magnification the tooth appears to be clean; boxes show areas illustrated in 2.2 and 2.3. Microwear patterns can be identified at this magnification. 2.2 Enlargement of area in box 2 of 2.1; at higher magnification it can be seen that the microwear (part highlighted with solid white lines) is largely obscured. 2.3 Enlargement of area in box 3 of 2.1 and 2.2; at higher magnification it is clear the surface is still coated in consolidants and the microwear patterns (part highlighted with solid white lines (visible microwear) and dashed white lines (obscured microwear)) are largely obscured.