Re: paleonet Systematics surprisingly interesting Pt.II

["Jere H. Lipps" <jlipps@xxxxxxxxxxxx>]

At 06:16 PM 10/4/2005, you wrote:

--- "Dr. David Campbell" <amblema@bama.ua.edu> wrote:

 ...The lack of seafloor over ca. 200
 million (except where it's squashed up with other

rocks,

 showing evidence of past convergence and not
 just divergence) ...

Oh - so there is some.

Ophiolites, I think they are called.  Found mashed into continental rocks at extinct convergence/suture zones.

Yes, or melanges, subduction complexes, exotic terrains, etc.   Lots of old rocks preserved in the former, or even active, subduction zones, but usually hard to identify and work properly.  But it's been done on the west coast of NA and the Alps, as well as other places.   That's where a lot of biotic history must be preserved--deep or deeper sea, pelagic or planktonic, and mesopelagic biotas--if we knew what we were looking at or for.