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new technique to me

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iowabow:
Thanks guys. Wonder if I can do it again.

Stringman:
I've seen a lot of gains in your thinning lately. I'm betting you'll do it again.

BBPM

Hummingbird Point:
That looks similar, kind of, to how quartzite and other tough stone is worked.  The natural tendency with a typical quartzite spall is to end up with a diamond shaped preform.  This is because it is so hard to get thinning flakes into the midle of the piece that the best approach is often to blast them in from all four sides at an angle that so they hopefully overlap in the middle.  So on your piece, you have that big flake at 7 or 8 o'clock.  On quartzite (or other tough stuff) the next move would be to sacrifice the top right corner to create a fairly heavy platform, then try to drive a flake at an angle toward the middle of the piece long enough to over lap the other flake.  Then the same thing is done with the bottom left corner, and viola, a diamond that with little modification is a Morrow Mountain point, or with a bit more work, a Savanna River.

I believe Steve Nissly uses a similar approach on tough Pennsylvania Ryholite and Argilite.

I agree with Stringman, you are really humming along!

Keith

iowabow:

--- Quote from: Hummingbird Point on December 19, 2015, 01:44:08 pm ---That looks similar, kind of, to how quartzite and other tough stone is worked.  The natural tendency with a typical quartzite spall is to end up with a diamond shaped preform.  This is because it is so hard to get thinning flakes into the midle of the piece that the best approach is often to blast them in from all four sides at an angle that so they hopefully overlap in the middle.  So on your piece, you have that big flake at 7 or 8 o'clock.  On quartzite (or other tough stuff) the next move would be to sacrifice the top right corner to create a fairly heavy platform, then try to drive a flake at an angle toward the middle of the piece long enough to over lap the other flake.  Then the same thing is done with the bottom left corner, and viola, a diamond that with little modification is a Morrow Mountain point, or with a bit more work, a Savanna River.

I believe Steve Nissly uses a similar approach on tough Pennsylvania Ryholite and Argilite.

I agree with Stringman, you are really humming along!

Keith

--- End quote ---
Keith thank for your input. This so cool to get this kind of information. I have never work quartzite and had no idea how you guys could make anything from it. It's this kinda back and forth of information on the PA fourm is really all about. Thank for the post kept it coming. I am sending you a pm

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