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E, You may be personaly responsible for saving a true tool from the dump pile and into the display frames of tool collectors.. Just a quick look at "core" flint might show that shattered hammer stone effect. I just got another one at Floyds that just accidentally looks like yours with a slight conical design to it. Larry has found 2 of these around the dig....Not quite conical but all are near round.
Nother one, from Chrisner's 6-3 fractured all the way round