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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.