Figure 1.

Stratigraphic section including some of the paleontological and radiometric sampling sites in the upper Cedar Mountain Formation, Emery County, UT. Four of the principal fossil sites are in the section; an additional 27 sites (not shown) lie in the same part of the section and are interpreted as being of similar age. The three WS10 ash samples (Table 2, Fig. 2) were collected at the level of the asterisk; sample 1465–1+1 was collected from the same level in a measured section 6 km to the NE.