Re: The Fist Glacial Maximum in North America

From: Daryl Krupa (icycalmca_at_yahoo.com)
Date: 01/23/05 

Date: 23 Jan 2005 11:31:56 -0800

Philip Deitiker wrote:
> icycalmca@yahoo.com says in
> news:1106385495.955806.130810@f14g2000cwb.googlegroups.com:
>
> >
> > Philip Deitiker wrote:
> >> This article is in the magazine Science 307:222
> >> Balco, Rovey and Stone, 2005
> > <snip>
> >> This paper depicts the onset of
> >> the first major iceage in north america
> >> around 2.6 to 2.53 mya
> >> (FGMNA).
> > <snip>
> >
> > "FGMNA", of course, means
> > "First Glacial Maximum in North America",
> > as in:
> >
> > G. Balco, C.W. Rovey II, J.O.H. Stone
> > The First Glacial Maximum in North America
> > Science, Vol 307, Issue 5707, 222, 14 January 2005
> >
> > But it seems that the date on that "Atlanta" glacial
> > deposit is somewhat younger than reported above, i.e.
> > 2.4 Ma, and possibly as old as 2.45 Ma.
> > Using a different calibration standard would have
> > given an age of 2.64 Ma.
> > The marine record suggests a cold phase at about
> > 2.58 Ma.
> >
> > One wonders where "around 2.6 to 2.53 mya" comes from.
>
> Me, I was trying to digest this down based on what I observed.
>
> P.S.: The beginning of the Quaternary has already
> > been considered to be at about 2.6 MA, based on
> > several other types of records; climate had been
> > coolish before that, but not for extended periods:
>
> I didn't know that, again I don't keep up to date on the
> paleoclimatology past 800 kya.
>
> So in your opinion the sudden appearance of stone tools in africa
> could be an artifact of regionally biased sampling and sudden shifts
> in hominid population.
> How should one correct for these climactic factors when considering
> the latest data assessments at Gona, and the holoconclusion that this

> represents the abrupt appearance of stone tool use.
>
> --
> Philip
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