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Some of the first radiocarbon dates produced showed that the Scottish tombs were thousands of years older than those in Greece.

The barbarians of the north were capable of designing complex structures similar to those in the classical world.

In 2008 we could only calibrate radiocarbon dates until 26,000 years.

Now the curve extends (tentatively) to 50,000 years.

These new techniques can have a dramatic effect on chronologies.

With the development of a new method of cleaning charcoal called ABOx-SC, Michael Bird helped to push back the date of arrival of the first humans in Australia by more than 10,000 years.

Australian National University provides funding as a member of The Conversation AU.

In this way large domed tombs (known as tholos or beehive tombs) in Greece were thought to predate similar structures in the Scottish Island of Maeshowe.

This supported the idea that the classical worlds of Greece and Rome were at the centre of all innovations.

If 1% of the carbon in a 50,000 year old sample is from a modern contaminant, the sample will be dated to around 40,000 years.

Because of this, radiocarbon chemists are continually developing new methods to more effectively clean materials.

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In the 19th and early 20th century incredibly patient and careful archaeologists would link pottery and stone tools in different geographical areas by similarities in shape and patterning.

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