Re: Ballard Chases History Again In The Black Sea

On Mon, 20 Aug 2007 14:21:26 +0200, "Peter Alaca"
<p.alaca@xxxxxxxxxxxxxx> wrote:


That's precisely the point. The two of you have different
understanding of what is 'fast'. Gradual could be flooding over a
year, or over 100 years. In either case it is not a flashflood. But if
it is over 100 years, one might expect a number of drowned beaches and
reworked surface whereas if it was over a year, indeed there might be
some vegetation preserved, at least sub-soil in the root level.
(Actually, if they find tree roots that would be a great way to date
the flooding.)

Ik takes at least a year for the vegetation to adapt
to a significant change in waterlevel.
And many graslands, in the past and today, are
waterlogged or drowned for the best part of the year
and still are used, mostly for haymaking.

Right. At this point, AFAIK, we simply do not know about the nature of
the evidence. At least I don't. It is reasonable to assume that the
vegetation was like a steppe before it was flooded. Whether it was
transformed very slowly, such that the vegetation could adapt to new
conditions, or whether the old vegetation simply vanished under water,
we don't know yet.

As far as I know, Ballard has found a house down there with
upright-standing walls. That does not sound like it was subjected to
beach processes for even weeks, it may have gone faster.

That does not sound like it was subjected to a flashflood.
A flashflood comes with great force in one or two days, so
standing walls are less likely.
And the vegetation becomes covered with sand, clay, silt
or debry.

Depends on location in my view. Right next to the Bosporus it might
have been a flash flood, but not inTrabzon or at the north shore of
the Black Sea. Ryan etc. estimated that if it went fast, filling of
the Black Sea took a year or three. That is extremely fast in
geological terms, but gave people enough time to walk away with their
sheep flocks. They may not have known the reason why the water
suddenly rose, but they surely became wary, carefully keeping a
distance from the water just in case, and re-developed a trust in the
new MSL only after a couple years after the water stopped rising.

Still, it will be interesting to see the results of what the former
landscape looked like, wether it was reworked by short beach dynamics,
just went under water, or whatever.

Hayabusa



.

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