Hi Arm-
Sounds/looks like you have a great site. Many different types of points can be found on same site- as many generations lived or passed through there, perhaps. And, as new technologies were developed, I think they added them to their repetoire of point styles. Your blade, I think, is a 'cache' item - as in one of many either in transport as a workable rock, already pre-knapped or-- an item in a number of same items (for whatever purpose- trade, stockpile supply, etc.) In my area, I blame the seasons and migration. People came and went depending on whether it was hunting or fishing season. They weren't even close to 'permanant' till much later in history. Just think of how many families can live in a house (old house, think Europe) and all the things they'd have or ad to the home over the years. So, many types of points in one place? Makes sense to me...
From what I've learned, it's nearly impossible to nail down type of point w/o the base. Also, there seem to be a lot of basic forms from which finer- more definable points/blades were made. Also lots of really rough types that don't really have a catagory- just untility, but clearly a point/blade of some sort. This may be why you're not getting id's. I don't see an earlier post-- did you post and not get adequate response?
Regardless, good luck and show us what you find. There are some very good people here- they know their stuff!
Riverhunter