Jurrasic Park around the corner?

[viper]

Have you ever heard of tree rings? In particular tree rings preserved in tar pits and peat bogs, fossil trees, and finally trees preserved in volcanic deposits (most common).... you know the date of the event that killed the tree/preserved it (why its volcanoes mainly)..... and cross reference with carbon dating = tests on its accuracy.

You\'d be surprised how many date verification systems out there.

Also, cores taken in lakes (excellent sources of climatic data) and glaciers have shown that carbon ratios have not changed during any milankovitch cycle (read up on them aswell if you want to talk about stuff like this), and as the half life of c14 and c12 are known, and the ratio they exist is known the dating system is very very accurate (on geologic time scales).