In the Dugway Range, the massive, cliff-forming, peloidal, stromatoporoid-
bearing reef facies is intercalated between thick-bedded,
carbonate-platform rocks of the lower Famennian, upper Guilmette
Formation below and thin-bedded, upper-slope rocks of the Famennian
West Range Limestone above. The carbonate facies in the
Dugway Range represent the southernmost extension of carbonate bank
that is equivalent to and continuous with the so-called False Birdbear
unit of the upper Jefferson Formation in Idaho, the upper limestone
unit of the Logan Gulch Member of the Three Forks Formation in
Montana, and the Morro Member of the Palliser Formation in Alberta,
Canada. Carbonate-bank facies deposition persisted
in an extensive, north-south–trending belt from the northern Great
Basin into southern Alberta for at least 3 myr until the middle
Famennian lower Palmatolepis marginifera biozone.