The history of radiocarbon dating

Marine records, such as corals, have been used to push farther back in time, but these are less robust because levels of carbon-14 in the atmosphere and the ocean are not identical and tend shift with changes in ocean circulation.

But that assumes that the amount of carbon-14 in the atmosphere was constant — any variation would speed up or slow down the clock.They used pottery and other materials in sites to date 'relatively'.They thought that sites which had the same kinds of pots and tools would be the same age.Two distinct sediment layers have formed in the lake every summer and winter over tens of thousands of years.The researchers collected roughly 70-metre core samples from the lake and painstakingly counted the layers to come up with a direct record stretching back 52,000 years.

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  1. Yeah, he made those old-time NSDs filthy rich and they never let you forget it. If you wonder where we’ve been, please see our last post dated February 14 (here) Ever wonder why Mary Kay wants you to have all that inventory on-hand as a consultant?