It's interesting to note that geologists making ice cores in Greenland discovered a high level of lead in the ice corresponding to the Roman period when a lot of Lead smelting took place. Then it went down again and went up again when Lead was added to gasoline. :-)
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David
2008/8/11 steven mckenzie <goldgrif@...>
Sorry for the Cross Post, but I thought this was pretty interesting, and maybe very important, we are, by geology ( a human endeveor ) in a new age.
http://www.alternet.org/environment/89940/the_era_of_catastrophe_geologists_name_new_era_after_human_influence_on_the_planet/
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David
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