FIGURE 19. Biochronologic position and correlation of faunas included in this study. Ages after Tedford et al. (2005) and Voorhies (1990a, 1990b). 'Ba2a', 'Ba2b', and 'Ba2c' are informal subdivisions of the late Barstovian based on previously recognized distinctions between Norden Bridge Quarry Fauna (Ba2b), the Valentine Railway Quarries Fauna (Ba2c), and the Wood Mountain Fauna (Ba2a). "Primary faunas" refer to published faunas and/or faunal assemblages that are relatively diverse and well-constrained in age; "equivalent faunas" are unpublished, considered correlative to the primary faunas, or less diverse and/or constrained in age. Dashed outline for 'Scrappy Hill' faunal assemblage indicates that the age is not refined within the Clarendonian NALMA.