Fig. 15.7 in Chapter 15: Moropus merriami in the Early Barstovian Lower Snake Creek Fauna of Nebraska, with Comments on Biogeography of North American Chalicotheres

Fig. 15.7. Correlation chart showing relative ages of chalicothere fossil occurrences mentioned in the text. For more complete listings of occurrences (such as possible late Hemingfordian single occurrences of Tylocephalonyx in Utah and north­central Colorado) and discussions of localities see Coombs (1978, 1979, 1998) and Skinner (1968). The possible arrival in North America of Moropus in the late early Arikareean follows Coombs (1978, 1998) and Tedford et al (1987). Dating of deposits yielding chalicotheres follows Tedford et al (MS), Albright (1999), Prothero et al (2001), and Janis et al. (1998). Tyloceph. = Tylocephalonyx.