Interim Geologic Map of the West Part of - Utah Geological Survey

Figure 3. View northwest to North View overlook at Cedar Breaks National Monumentshowing contact between Claron and Brian Head strata (the North Overlook is on basalstrata of the gray volcaniclastic unit of the Brian Head Formation, Tbhv). Sable andMaldonado (1997b) assigned variegated, nontuffaceous mudstone, siltstone, and minorsandstone and pebble conglomerate (here labeled Tcwt, 109 feet [33 m] thick) to theirlower Brian Head Formation. However, these strata appear identical to strata of themiddle white unit (Tcwm); they are nontuffaceous and appear simply to be an uppermostfacies of the white member of the Claron Formation, to which we assign them. The top ofthe Claron, as defined here, is marked by a thin, calcareous, pebbly sandstone that hasrounded clasts of chert, quartzite, and Claron limestone but apparently no volcanicclasts.Tcwu Upper limestone interval of white member (Eocene) – White, pale-yellowishgray,pinkish-gray, and very pale orange micritic limestone and uncommonpelmicritic limestone, locally containing intraformational rip-up clasts; locallycontains sparse charophytes and planispiraled snails; typically poorly bedded andknobby weathering; locally vuggy with calcite spar and commonly cut by calciteveinlets; resistant and so forms prominent ledge and flat ridge tops; upperconformable contact with Tcwt corresponds to a pronounced color change fromwhite to very pale orange micritic limestone below to brightly colored reddishorangemudstone and siltstone above; queried at the south end of the Red Hills,and near Mineral Canyon northeast of Paragonah; thins to the west from 80 to 100feet (24-30 m) thick in the southwest quarter of the Haycock Mountain48