Dating method glaciation
The Hilgard glaciation may have simply been the last stade of the Tioga glaciation from the evidence found in this study.
At least four Pleistocene glaciations occurred in the southeastern Sierra Nevada.
All four postdate most of the significant incision of streams through the escarpment.
The three youngest probably correlate with the Tioga, Tenaya, and Tahoe stages (in order of increasing age) recognized throughout the Sierra.
The study area extended from the alluvial fans of Owens Valley west to the Sierra crest from latitude 36°45' N to 37°00' N.
It included the southern part of the Big Pine volcanic field, an eruptive center for basaltic lavas for most of the Pleistocene Epoch.
Below the foothills coalescing alluvial fans grade a few km east to the alluvium and lacustrine sediments of the Owens River and Owens Lake.
In each case, moraine morphology has been well preserved.
Tioga moraines were found down to about 2200 m elevation. The terminal moraines of the youngest of these were sometimes intact.
The oldest Holocene glaciation (Hilgard) left few large moraines in the study area.
Hilgard glaciers extended much farther down-canyon than the younger Holocene glaciers, sometimes within one or two km of the Tioga terminal moraines.