Figure 4. Resulting OSL ages for deposition on LRR alluvial fans and two terraces of the E. Fork Big Lost River. The gray shaded boxes show distinct episodes of deposition, and Qaf at the top of the gray boxes indicates Quaternary alluvial fan deposit. The number following Qaf indicates chronological order for the deposits with larger numbers showing older deposits. These intervals correspond to surfaces shown in the map of Figure 5. Shown below is the OSL ages are the general climate conditions for the region for 0-60 ka. A comparison between the timing of fan aggradation in the LRR and these climate records suggests that deposition on fans has been enhanced during periods of cool to cold climate.
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