Re: human ancestors never passed through a knuckle-walking phase

"Lee Olsen" <paleocity@xxxxxxxxxxx> wrote in message
news:1182262880.245251.181010@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx

And that is because the rate of
change (and of erosion) is orders
of magnitude greater than you think.

You didn't say anything, you just repeated your same imaginary tale.
Soft bricks last 30 years on a gravel beach and you can still tell
they are bricks. They aren't nearly as hard as a flint axe. If
anything should be turned to dust quickly it would be a brick, but
they don't.

Possibly (this is only a guess) bricks
have a lower density than rocks (i.e.
contain more small bubbles of air) and
are tossed higher on the beach by the
initial wave action -- and so escape the
pounding and grinding sufferred by
the bulk of the gravel.

This applies to objects as heavy as auto-engine blocks as well. Same
for handaxes.

What applies "to objects as heavy as auto-
engine blocks"? You don't see many over
30-years-old in the inter-tidal zone. Even
at the bottom of the ocean they rust away
-- like the Titanic or other ships -- over a
couple of hundred years.

Message-ID: <1160591403.300991.275...@xxxxxxxxxxxxxxxxxxxxxxxxxxx>
http://www.cooltrails.com/ozette.htm
"The next day we continued south past Wedding Rocks and the 30-plus
petroglyphs left there some 300 years ago by the Makah and Ozette
Indians. Look for them on dark volcanic rocks at beach level just
south of the large outcropping. Many are below tide line and all
require some searching."
What part of "Many are below tide line ..." are you too stupid to
understand?

This is from some blog of a casual traveller
who probably thinks the world was created
6,000 years ago, and understands geology
and erosion about well as you -- or about
as much as the average worm, fly or
millipede does.

However, those cliffs will serve to show
how little you understand about this
planet. NONE of them are more than
12,000 years old (when sea-levels last
rose).

Sorry, the sea levels have raised and lowered many times over the ice
age or last two million years.

So what? They've changed over the last two
billion years. Try to focus -- here on the last
12 Kyr. Notice the visible MINIMUM amount
of erosion in that time -- those 120 feet of solid
rock. Very roughly that's 10 feet every 1,000
years or one foot every 100 years, or three
feet in 300 years. Was the writing on those
petroglyphs etched into the rock to a depth
of more than three feet?

All that erosion took place in the last
12 Kyr -- and probably about 100 times
more than we can see. (Since we can't
see eroded landscape.)

YET you maintain that marks cut into
an exposed rock would not wear away
in 300 years !

You forgot something

No answer -- all you can do is repeat this
gossip from some tourist who is so ignorant
(not particularly blamewothy in a tourist,
btw) that she might as well have come from
your planet.


Paul.


.

Relevant Pages

  • OT: was Re: human ancestors never passed through a knuckle-walking phase
    ... On Jun 20, 3:35 am, "Paul Crowley" ... Soft bricks last 30 years on a gravel beach and you can still tell ... "The next day we continued south past Wedding Rocks and the 30-plus ...
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  • Re: human ancestors never passed through a knuckle-walking phase
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