Re: problem

Glenn R. Morton (grmorton@waymark.net)
Thu, 20 Aug 1998 19:51:48 -0500

At 02:44 AM 8/20/98 -0700, Cliff Lundberg wrote:
>Glenn R. Morton wrote:
>
>> You might be aware that the Cambrian explosion is beginning to look
>> a bit less explosive.
>
>Sure, there was a lot of precambrian life. But the first vertebrates in
>the fossil record were quite complex, and no progenitor is apparent, unless
>you believe some of the wishful and speculative scenarios out there.

Well, the vertebrates first appeared in the Late Cambrian and so are not
really associated with the Cambrian explosion at all
>
>At any rate, compared to the subsequent pace of innovation in anatomy,
>the Cambrian is fairly called a time of explosive evolution.

I don't know, a fellow I know on internet pointed out that lots of phyla
appear after the Cambrian:

Phylum Earliest Appearance
in Fossil Record
---------------------------------------------
Dinoflagellates Triassic
Calcareous nanoplankton Triassic
Diatoms Cretaceous
Bryophytes Late Paleozoic
Psilophytes Middle Paleozoic
Lycopods Silurian
Sphenopsids Devonian
Ferns Devonian
Cycadeoids Middle Paleozoic
Ginkgos Early Mesozoic
Conifers Late Paleozoic
Angiosperms Early Cretaceous
Bryozoa Ordovician

glenn

Adam, Apes and Anthropology
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