A note on Al McGrew's comment on metamorphic core complexes:
I have no problem with Coney' definition, except that the notion
"older" for the lower plate part should be deleted. Intuitively, the
metamorphic core would perhaps be regarded as older, and in many
complexes, this may be so, but it doesn't have to be.
It is a bit reminiscent of the "classic" view in the earlier days of
geology, when everything that's high-grade metamorphic, deformed and
at the bottom of the pile was considered older than the rest.
Cheers, Juergen
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