Geologists believe that fifteen terraces in the upper Wind River Basin of northwest Wyoming are correlated to multiple ice ages. However, field examination reveals only four significant terraces: WR1, WR3, WR7, and WR9. The bottom two, WR1 and WR3, were connected to glacial outwash from an ice cap over the Wind River Mountains but were likely formed during the same glaciation, not from two distinct ice ages, called the Pinedale and Bull Lake glaciations in the uniformitarian scheme. Although terrace WR7 is claimed to be linked to the Sacagawea glaciation, the moraine in the type area for this glaciation is not physically connected to terrace WR7. This moraine has similar geomorphology to the "Bull Lake" and "Pinedale" moraines, suggesting just one glaciation for all these moraines. Terrace WR7 also has contradictory dates ranging up to about 660 kyr, based on dates from the Lava Creek B ash in WR7. This date indicates three missing glaciations. The few terraces above WR7 are not associated with any glacial feature, despite geologists’ claims. Due to uncertain dating of WR7, the dates of higher terraces are equally uncertain. Terraces above WR3 are best understood as pediments and planation surfaces formed during channelized Flood erosion and runoff in currents moving toward the southeast through the Upper Wind River Basin.