UTAH COUNTY
CLAY PIT
UPPERMOST UNITS OF THE MANNING CANYON SHALE FORMATION
UPPER CHESTERIAN
SERPUKHOVIAN EPOCH
LATE MISSISSIPPIAN OR LOWER MORROWAN
BASHKIRIAN EPOCH
EARLY PENNSYLVANIAN
MIDDLE NAMURIAN
LOWER SILESIAN SERIES
STEM: TETRAPODA GOODRICH, 1930
SUPERCLASS: AMNIOTA HAECKEL, 1866
CLASS: AMPHIBIA LINNAEUS, 1758
SUBCLASS: LEPOSPONDYLI ZITTEL, 1888
ORDER: MICROSAURIA DAWSON, 1863
Incertae sedis
*Utaherpeton franklini