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Date: | Mon, 11 Jun 2007 09:19:57 -0500 |
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correctomundo!
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Pleistocene extinctions? Clovis kaput? It was the bolide, stupid!
PS - Carl, you're so right about the nice knappability of the glass and the
nasty nature of the debris; 35+ years after my first "lesson" knapping old
mirror & plate glass, my fingers still show a lacey palimpsest of scars from
it.
----- Original Message -----
From: "Carl G. Carlson-Drexler" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Monday, June 11, 2007 8:42 AM
Subject: Re: Flaking on edge of wall mirror
> Unlikely that it was ground. The detail photograph shows what could be
> errailleur scars around the point of percussion. Perhaps someone took a
> punch, placed it at regular intervals around the edge of the back of the
> mirror, and gave it a light tap with a hammer. Not the removal of material
> at the small end of each cone, which are clearly blown out, not ground.
> Glass like that can have high internal consistency, making it relatively
> easy to flake in a predictable manner. I've knapped projectile points from
> it back in my undergrad, and it works beautifully, though the dust from it
> will cut your hands to ribbons. Can't help with the name, but look at each
> flake as basically one half of a BB hole in the window of your local fast
> food joint.
>
> Scarred,
> CGCD
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