See I'm finding a whole bunch of this kind of stuff in one area and they seem to be all unfinished or just started it and then discarded it so I'm not sure what was going on in that area
The peice in the first few pics looks similar to a cone shape but they are usually smaller i think. The last peices dont appear to be artifacts , though some are in the general shape of point .I dont see any flaking at all and the material doesn't look like something one would be made of. Just my opinion