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The purpose of re-sampling them is to test calibration between laboratories in New Zealand and the US.Richard Jones is cutting small 2cm thick pieces off the surface of a boulder with a rock saw.A previously assumed Neoglacial advance is dated to 3.6 /- 0.3 ka and the CRN dates confirm a glacial advance ca. These results show that glaciations on the south side of Everest were not synchronous with the advance of Northern Hemisphere ice sheets, yet glaciations within the Himalaya, the world's highest mountain belt, were synchronous during the late Quaternary.

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This video gives a very good introduction to the use of this surface exposure dating method for dating glacial moraines in New Zealand, featuring David Barrell from GNS Science, along with colleagues from the US.

Accurate terrestrial glacial chronologies are needed for comparison with the marine record to establish the dynamics of global climate change during transitions from glacial to interglacial regimes.

The surface exposure ages based on various currently accepted production rate scaling protocols yield age differences of up to 35% reflecting the poor knowledge of terrestrial cosmogenic production rates at low latitude/high altitude sites.

Even within this conservative uncertainty range, our results do not yield evidence for late Pleistocene glaciations in monsoonal Tibet to be asynchronous to those in mid-latitudes on both hemispheres.

The distribution of cosmogenic ages from the three ridges of the old moraine sequence is inconsistent with their stratigraphic order.

Because exposure periods of the erratics prior to deposition on the moraine surface is shown to be small, the chronology-stratigraphy mismatch suggests that the cosmogenic ages do not date moraine deposition but most likely significant moraine ridge denudation and related boulder exhumation after initial deposition of the moraines during the penultimate glacial cycle or earlier.

This photo shows how Lake Ohau is dammed by a rim of 18 000 year old moraines around its southern margin.

They are the low lying hummocks you can see near to the lake, as well as in the foreground.

The technique depends on the fact that the atoms in quartz (Si O) in the rock are constantly being bombarded by cosmic ray neutrons.

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