Re: Re:

Date: Tue Dec 03 2002 - 14:07:02 EST

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    From: "D. F. Siemens, Jr." <>

    On Tue, 3 Dec 2002 09:44:29 -0600 "Darryl Maddox" <>
    > I think this is the wrong question. I think the correct question is
    > not how
    > fast corals grow but rather how fast do coral reefs accumulate.
    > But to attempt to answer the question - as I understand it, we know
    > how fast
    > corals grow because some of them at least have daily growth rings
    > and monthly
    > and annual growth variations of some type so that as you come up
    > through the
    > geologic record we see more and more days per year. But keeping in
    > mind the
    > daily, monthly, and annular variations in growth pattern, if I were
    > wanting
    > to answer the question of how fast a coral grows I would not only
    > measure
    > the current growth rate of live corals but also measure the change
    > in the
    > size of the various species of fossil corals per unit of time -
    > daily,
    > monthly, and annual and continue doing this for enough of
    > individuals of
    > various species to get specie specific averages and standard
    > deviations and
    > see how much variation there is between various species, genera etc.
    > I
    > suspect this has already been done. But even if it has been done it
    > is
    > irrelevant to the question of how fast a reef builds because of the
    > previously pointed out continuous interaction between the growth
    > process of
    > the live corals and the destruction/accumulation process of wave
    > action,
    > storms, and variations in sea level. How to answer the question of
    > how fast
    > coral reefs have accumulated in the past I leave to others because
    > other
    > than guessing it might be done somehow with isotope geochemistry or
    > some of
    > the newer radioactive decay schemes I have no idea how to do it
    > except in
    > the unusual case where you might have the base of a coral on a well
    > established time horizon and the top sticking slightly through
    > another well
    > established time horizon.
    > <snip>
    > Darryl

    Oh, Darryl, don't you know that all geochronology is based on mistakes?
    ;-) As for growth rings, I recall an article in one of the YEC
    publications that claimed that the bristle cone pines sometimes produced
    two growth rings in a year. I figured that there had to be at least one
    extra ring every other year (3 rings in 2 years) to fit the record in
    living and dead trees. With all data subject to such manipulation and
    misrepresentation, rational analysis is hopeless.

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