I think one thing that is good to remember, every so often, is that we moderns are creating the typologies. Whatever else the appearance of large side notched points represented in the eastern United States, we can be certain the natives were not calling them Big Sandy points, or Otter Creek points. The actual relationship among these points is too uncertain. But, appearing at about the same time in the archaeological record, it is fair to at least ask if there is a relation between the appearance of Big Sandy, and the appearance in the Northeast of Otter Creek points. But, typology is still largely regionally based, and we have a plethora of names for very similar appearing points. The actual data, the actual points upon which typologies are based, are not artificial. But, try as we may, our typologies will always be somewhat artificial. How often do we find points, only to find ourselves struggling to force them into a recognized type? None of our typologies existed in the past, in the real world. But, IMHO, nothing makes typing points more difficult then basing the descriptions on the region where the point was found. Yes, there were different cultural expressions at different times in different regions. But there were no barriers between regions. No Native American had to refer to typologies when fashioning projectiles.