[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index][Subject Index][Author Index]
RE: mass extinctions and technology
At 12:56 PM +1000 9/30/02, Mark Harvey wrote:
You have got to start somewhere. To my knowledge, the organic
environmental geochemistry of extinction boundary sediments has
never been examined.
The inorganic geochemistry also may have something interesting to
say. For example, lead levels in sediments have been elevated since
lead mining started in Roman times. I believe they dropped in
medieval times, then rose in the industrial age.
-- Jeff Hecht