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Rock find ( pic added)

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Tower:
Water boils at 212 degrees at sea level. At a lower temp in higher altitudes. 

mcginnis6010:
Sorry for the missing info i was pretty excited to find it as ive only ever been able to knap some obsidian and most everywhere around me is nothing but shale and clay. Its from Virginia found in the South River in the Shenandoah Valley. I found it in the portion of the river thay flows through Waynesboro. It definitely will produce flakes and there were some conchoidal fractures already present on some of the rocks when i found them. They alao make a nice glass sound when you tap a metal hammer on them.

Dalton Knapper:
Knap some of that stuff - that info you gave is promising! Maybe someone can give it a name.

(Tower - sorry for the temp confusion - my memory is only partly accurate part of the time except for when I am right and then I am told by my wife that I am pretty much wrong anyway - 212 - I should have remembered that!)

Zuma:
Sounds like Grottos or the Merk plant area.
In my opinion you have some what I call North River chert. My guess is that you have discovered a material cashe.
What I see all looks modified from what it would look like in it's original form.
Most I find is lenses in limestone outcroppings of the Devonian age. One thing that puzzles me is the size of the pieces. Pretty rare to find chunks that large. May have been in a canoe for transport when it tipped over.
You should find that it knaps well enough without heat but do not expect to get large blades as it should be
riddled withstress cracks. The same black and gray cherts can be found just west of the Blue Ridge from NY to GA

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