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impossible extinctions

i find it interesting that everyone is talking about the "P-T" extinction
(sic).  How can we have a Permian - Tertiary extinction?  



Oh you meant the Permian-Triassic extinction?  well the proper way to refer
to that one is "P-Tr" extinction!  

recall T = Tertiary
      Tr = Triassic
b
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Bonnie A.B. Blackwell,                          bonn@qcvaxa.acc.qc.edu
Dept of Geology,                                off: (718) 997-3332
Queens College, City University of New York,    fax: (718) 997-3299
Dept of Earth \& Environmental Sciences,        messages: (718) 997-3300
The Graduate Center, CUNY,                      
Flushing, NY, 11367-1597, USA