Posted: under Earth Sciences & Geology.
Tags: Australopithecus Afarensis, Carbon 14, Carbon Dating, Fossil, Fossils, Free Dating, Memory, Orders Of Magnitude
southeastside asked:
Yesterday there was news of a 3.3 million year old Australopithecus afarensis fossil from Ethiopia. I’m just curious as to how they ascertain the age. I know it’s not carbon-14 dating, that’s 2 orders of magnitude beyond its range. It’s been a while since I learned about this stuff, so thanks for refreshing my memory.
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May 02 2009
Posted: under Earth Sciences & Geology.
Tags: Absolute Age, Decay, Liquids, Radiometric Dating, Rocks
twizz asked:
In radiometric dating, scientists use the rate of decay of radioactive materials in rocks to estimate the absolute age of a rock. That tells them the age of fossils found in that rock.
Radiometric dating allows scientists to find fossils in only the lowest and oldest layers of sediment.
In radiometric dating, scientists place samples of a fossil in certain liquids until the samples dissolve. The rate at which they dissolve indicates the age of the fossil.
In radiometric dating, scientists mix the carbon in a fossil with carbon from similar fossils whose age they know. By comparing, the carbon they can tell the exact age of the fossil.
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Jan 24 2009
