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Different methods have their own limitations, especially with regard to the age range they can measure and the substances they can date.

A common problem with any dating method is that a sample may be contaminated with older or younger material and give a false age.

“Traditional approaches have a difficult time identifying when ice sheets were smaller," Briner said.

"The outcome of our work is that we now have a tool that allows us to see how the ice sheet responded to past times that were as warm or warmer than present — times analogous to today and the near future." The technique the scientists developed involves dating fossils in piles of debris found at the edge of glaciers.

So, there are different types of fossils: Obviously fossils became more common after the appearance of hard parts (shells, teeth, bones …), 543 million years ago (Cambrian Explosion).

The fossil record prior to this period is very scarce.

The scientists had no evidence for how old the fossils were.

Without that information, it was very hard to know where the new species fits on the tangled human family tree, and to figure out its true meaning.

If we look at what coordinates are oriented such minerals at the site, we can associate it with a particular time.

Credit: Jason Briner View of Upernavik Isfjord, where icebergs pass by on their way from Greenland to the ocean. “What’s really interesting about this is that on land, the atmosphere was warmest between 9,000 and 5,000 years ago, maybe as late as 4,000 years ago.

A new study uses Arctic fossils to illuminate the history of the Greenland Ice Sheet, which drains huge volumes of ice through a few select glaciers that calve into the ocean. The oceans, on the other hand, were warmest between 5-3,000 years ago,” said Jason Briner, Ph D, University at Buffalo associate professor of geology, who led the study.

This problem is now reduced by the careful collection of samples, rigorous crosschecking and the use of newer techniques that can date minute samples.

Volcanic rocks – such as tuff and basalt – can be used in dating because they are formed at a particular moment in time, during an eruption.