Arrowhead in PA - Brewerton or Otter Creek?
Based on what I see in the photo, I still would vote for the point being an Otter Creek-like point. As far as I can tell from the photo, the base looks to me to be quite heavily ground, and while Otter Creeks often have more squared bases, I have seen a number of points - and photos of points - with bases like this which were classified as Otter Creeks.
I found a nice Rhyolite point in North-Central Pennsylvania a couple of years ago (found it in February, on a 15 degree day with a whipping wind) that looks very much like Ryan's point, only smaller (about 1 and 3/4" long). The base is heavily ground. I showed it to Gary Fogelman, who agreed that it was an Otter Creek- like point.
If I am misreading the photo, and the base is not heavily ground (smoothed on the edges), then I would go with a Brewerton point.
For precision's sake, it should be noted that the classic Otter Creek point is a very large point whose type site, I believe, is in upstate New York or Vermont.
The smaller points of this description found regularly in Pennsylvania might best be referred to as "Otter Creek-like" points. This is how Fogelman classifies them in his Typology book.
Brewerton and Otter Creek-like points are roughly the same age and often are found together. Whichever it is, Ryan has made a home run find.
artorius