Oldest known fossil metazoans?

[John Bruner]

With Adolph Seilacher's worm tracks from the Vindhyam Basin, India, shown
to be only 600 my old rather than 1,100,000,000 years old, I am wondering
what is the age of the oldest known fossil metazoans (Kerr, 1999)?  Would
it be the paper by Breyer et ali (1995) of the sediment-filled tubes from
the Allamoore Formation of Texas, USA?  These were reported to be 1.4 to 1
Ga (1.4 to 1 billion years old).

Breyer, John A., Busbey, Arthur B., Hanson, Richard E., Roy, III Edward C.
1995.  Possible new evidence for the origin of metazoans prior to 1 Ga:
Sediment-filled tubes from the Mesoproterozoic Allamoore Formation,
Trans-Pecos Texas.  Geology.  Vol. 23(3):269-272.

Kerr, Richard A.  1999.  Earliest animals growing younger? Science Vol.
284(5413):412.

        John
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* Mr. John C. Bruner                                 *
* Department of Biological Sciences                  *
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