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Re: mammals over dinosaurs in continuous sequence
In a message dated 99-04-15 22:15:35 EDT, you write:
<< The presence of plant fossils and the
rarity/absence of hydroxyfluorapatite-containing fossils could be
explained as a result of acid leaching in the boundary zone ("Barren
Zone" of Archibald, 1982). Retallack suspects that the leached paleosol
is direct evidence of acid rain that was produced from the vaporization
of sulfate targe rocks from the impact bolide. >>
Dear <pb>, Could you please give the Retallack reference?
Another feature of the K/T fossil plant zone (at least in North Dakota) is
the presence of very extant, active, and very large scorpions. Dan Varner.