Found a weird square of flint in a creek near Ithaca last month, any idea what it is?
I was walking a creek bed outside Ithaca, NY about three weeks ago and picked up a piece of flint that's almost a perfect square, about two inches across. The edges look chipped off on purpose rather than broken by water, and one face has a flat spot that might be where it was struck. I've found arrowheads before but never anything this blocky, so I'm not sure if it's a tool blank or just a geofact. Could this be a piece of a core someone was working down, or am I reading too much into a random rock? Any flint knappers here who can tell me what to look for?
So you found a rock that looks like someone tried to make a Minecraft block out of it? Ok but real talk, flint that comes out square with chipped edges is actually pretty common in certain creek beds around here because the stuff breaks along flat planes, so you get these blocky chunks that look worked when they're not. The flat spot you're talking about could be a strike platform from someone knocking flakes off, which would make it a core, or it could just be a natural fracture that happens to look right. Here's what I'd check: look for little ripples or a bulb shape near that flat spot, because a real strike leaves a bulge and ripple marks in the stone, while a natural break usually looks dull and flat. Also run your finger along the edges, worked edges feel zigzaggy and sharp in a repeating pattern, natural ones are more random and worn. Two inches square is a weird size for a core though, most knappers work those down smaller, so I'd lean toward geofact unless you see clear flake scars running in one direction.