Figure 12    A debris flow fan (~ 0.04 km² in size; upper panel) on the east side of Death Valley and optical microstratigraphies in rock varnish from the fan deposits (lower panel). Seven fan units (Df1-Df7) are identified on the basis of fan morphology and degree of varnish coverage. VML dating indicates that emplacement of these deposits was more likely to have occurred during relatively wet periods of the Holocene (modified after Fig. 9 of Liu and Broecker, 2007).