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Re: Lazarus

At 03:20 PM 1/24/99 -0600, Chad Laibly wrote:
>Oops, forgot to ask. What is the Lazarus concept, idea, effect??

A Lazarus taxon is one which apparently "rises from the dead": that is to
say, it is found in the fossil record, then is missing, then reappears.  In
a sense all taxa known from more than one horizon are Lazarus taxa, because
they aren't found in every cm of sediment between the two horizons...  In
concept, though, it is generally used for long scale disappearances.

Note that a similar concept has been suggested: "Elvis taxa".  These are
forms which convergently evolve the appearance of an extinct form, sometime
after the first taxon died out.  (I'm serious here...).

Thomas R. Holtz, Jr.
Vertebrate Paleontologist     Webpage: http://www.geol.umd.edu
Dept. of Geology              Email:tholtz@geol.umd.edu
University of Maryland        Phone:301-405-4084
College Park, MD  20742       Fax:  301-314-9661