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Surface exposure dating no regestration dating

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Thus ages from boulders resting in dead-ice moraines and mass wasting landscapes underestimate deglaciation by 3–6 thousand years.The results quantify the impact of exhumation and landform stabilisation on cosmogenic surface exposure ages on millennial scales.While there is a slew of other dating techniques to choose from, cosmogenic nuclide exposure dating is useful for relatively young (~100 to 10 million years old) samples.If we are particularly interested in the timing of the uncovering of a surface—say, bedrock that had been covered by ice, or sediments that had been revealed by the incision of a stream—we can employ cosmogenic nuclide surface exposure dating to study that uncovering process.It was discovered about a decade ago that cosmic ray interaction with silica and oxygen in quartz produced measurable amounts of the isotopes Beryllium-10 and Aluminium-26.Researchers suggested that the accumulation of these isotopes within a rock surface could be used to establish how long that surface was exposed to the atmosphere.

Radiocarbon dating is abundantly used and offers very high precision dates, but we often want to date an event that is either too far in the past, or without the right type of organic matter, to be dated by C.

The implication is that climate during the Last Glacial Maximum was generally synchronous at the global scale.

However, the late-glacial readvance to 95% of the extent of the largest advance during the Last Glacial Maximum at 14.4±0.9 ka is distinctively “Antarctic” in nature.

This long period of applicability is an added advantage of cosmogenic nuclide dating.

Cartoon illustrating cosmogenic nuclide exposure ages. A glacier transports an erratic boulder, and then recedes, exposing it to cosmic rays.