Re: Lamination as a tool for distinguishing microbial and metazoan biosystems
From: Aidan Karley (aidan_at_mynameplus1.demon.co.uk.invalid)
Date: 11/12/04
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Date: Fri, 12 Nov 2004 13:33:48 GMT
In article <419431c8$1_1@127.0.0.1>, Jonathan wrote:
> > You must not be familiar with the concentrations of cave pearls,
>
> I've seen plenty of pics of them. And every little bowl
> is different from the next one due to different water flow etc.
> And none of them have asymetrical features such as a
> single aperture or off-center slash, but are highly
> symmetrical since they were formed by moving water.
>
Actually, typical cave pearls are formed in situations where the
water body is *agitated*, but does not have any great flow rate.
A typical situation is where you have a water drip into a clay
floor - the water will hollow out a splash pool into the clay (size
depends on drip rate), from which the water seeps away steadily over
the lip. So the net flow rate is quite low - the drip rate - but the
material in the splash pool is quite well agitated by the individual
drips. The agitation is what maintains the symmetry of the "pearl".
-- Aidan Karley, Aberdeen, Scotland, Location: 57°10'11" N, 02°08'43" W (sub-tropical Aberdeen), 0.021233
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