Fig. 2 in An Early Miocene Dome-Skulled Chalicothere from the ''Arikaree'' Conglomerates of Darton: Calibrating the Ages of High Plains Paleovalleys Against Rocky Mountain Tectonism

Fig. 2. Geology of the capping sandstones and gravels of the Patrick Buttes. Cross­hatching indicates buttes of the northern trend capped by the Barstovian Spoon Butte Beds; an open pattern indicates buttes of the southern trend capped by the early Hemingfordian Carpenter Ranch Formation. Gravels of the Carpenter Ranch Formation (table 1) were sampled at sites marked I through VI; gravels from localities marked by black diamonds were combined to form the composite Spoon Butte Beds sample. Site OBQ marks the acid volcanic­bearing terrace gravel of the Oberg Quarries. A stippled pattern shows the reconstructed areal extent of the Lay Ranch Beds, an early Miocene paleovalley fill containing latest Arikareean mammals.