dating glacial landforms figure 2 a photograph of r geographicum thallus measured on a moraine boulder from young et al 2009 b selected r geographicum growth curves from calkin and ellis 1980.
Glacial deposits recently a new dating technique that uses cosmogenic exposure ages has proven useful the technique measures the amount of time a glacierdeposited boulder has been exposed to the sun since last being moved enabling more robust age control and correlation to other glacial deposits throughout the region.
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Moraines are some of the best evidence of a glaciers last known extent because once the glacier starts to retreat it leaves the moraine behind photo credit brendon quirk large boulder from the solitude moraines sampled for cosmogenic exposure dating.
Glacial records from boulder mountain ut marchetti et al 2005 marchetti et al 2007 the middle boulder creek valley of the colorado front range ward et al 2009 and the animas drainage of the san juan mountains co guido et al 2007 all have roughly same timing of glaciations terminal moraine at 21 177 2 ka followed by retreat and re.
Moisture sources on glacier mass balance near the end of the last glaciation methods cosmogenic surfaceexposure dating to set limits on the timing of the lgm in the southwestern uinta mountains we targeted the most prominent lateral and terminal moraines from the last glaciation located at the mouths of the lake fork and.