Re: Coastal Erosion -- Dun Aengus

"Lee Olsen" <paleocity@xxxxxxxxxxx> wrote in message
news:1186589946.476238.299540@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx

"Dun Aengus??
"The Aran Islands, along Ireland's west coast, are a Gaelic treat.
They consist of three limestone islands: Inishmore, Inishmaan, and
Inisheer."
"Limestone"?? You said "go to any beach" You didn't say go to a soft,
crumbly LIMESTONE cliff that is falling apart into cobbles without the
help of the beach or the sea. You are a fraud, just like Verhaegin.
Just look at this photo:

No help from the sea? What a nut you are!

Access the site with Google Earth, and look
at some of the photos linked to location.
Many of them show the 300 foot cliff with
the sea at the bottom.

http://www.ricksteves.com/images/ireland/dun-aenghus.jpg

Those people are lucky the cliff didn't collapse under them, tossing
them into the sea also.

So you did see the sea. You must have
thought that since it was so far below, it
was having no effect on the cliff.

Limestone is, by far, the most common rock
in Ireland. It is generally a very common
rock and is not soft nor crumbly.

The issue was never argued against that fast errosion can't happen in
rare circumstances (I cited this myself at Shoalwater Beach, so why
repeat with Dun Aengus?).

There is nothing 'rare' about erosion.
It is visible on nearly every coast in
the world.

The issue was the stupidity of your statements:
Message ID: RVsag.9272$j7.305859@xxxxxxxxxxxxxx

"Hand axes were produced by grinding, and at an economical rate by
hominids. Put them on a pebble beach and they'd be ground (and broken) to dust
within a few years (or even months)."

So don't try a 'Verhaegian Switch' to change the subject to "errosion"
can happen relatively fast in some rare circumstances.

The subject was ALWAYS erosion. You
brought up what you thought was the
survival of some hand-axes on a beach,
which were almost certainly those recently
washed out from some local cliff or other
deposit.

http://www.maine.gov/doc/nrimc/mgs/explore/marine/facts/sep00.htm
"Each storm berm represents a deposit from a single storm. As the
waves break, they release enough energy to scour rocks from the base
of the beach and throw them up on the shore. As the tide increases,
the waves reach higher and higher levels, pushing stones, seaweed, and
driftwood up the beach. As each wave crashes it propels large and
small stones up the beach, but as it recedes, it has less energy and
can only pull the smaller and rounder stones back down the slope. In
this way, the larger, flatter stones are sorted out from the smaller,
rounder ones, ending up at the top of the deposit. As the height of
the storm passes and the tide begins to fall, the large stones and
floating seaweed are stranded at the height of the deposit."

Hand axes, of course, represent the larger, flatters rocks (by
definition, pebbles are max of c10 cm, hand axes can be up to 80 cm or
more in length and are somewhat flat compared to rounded beach
pebbles). The physics of pebbles on a beach work against ever turning
a hand axe to dust, let alone in a few months. If the pebbles are soft
limestone (3 Mohs scale) it would be like beating on a hard hand axe
(Mohs scale 7) with feathers, assuming you could keep them from
separating from each other and the waves. If the beach was flint
pebbles (7 Mohs) and even if you could keep the pebbles together with
the hand axe (7 Mohs) in the waves, my personal experience with
polishing rocks in a tumbler tells me the amount of time to turn any
hard rock/axe to dust would be astronomical.
For example, Apache Teardrops are pebble sized obsidian

Obsidian is known for its extremely hardness.

that are
quite round and smooth. It takes 24 hrs/day for a full week just to
polish these things with special polishing compound. Because of the
tides, no pebble/handaxe can be worked in the water continually by
wave action, as a rock in a tumbler (which runs all day and night),
this test already falsifies rocks to dust in "(or even months)."

Ridiculous. You clearly have never visited
this planet, and know nothing about it. The
machine you describe produces a slow gentle
grinding, or (more exactly) a polishing action.
It cannot be compared with the enormous
force of waves in a storm as rocks weighing
tons are smashed against each other, with
smaller ones that get in the way being
pulverised.


Paul.




.

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