Vosburg points are a a Late Archaic corner notched point assigned to the Laurentian Tradition series by New York State archaeologist William Ritchie. This series of points includes Otter Creek-Brewerton Side Notched-Brewerton Eared Notched-Brewerton Eared Triangle-Brewerton Corner Notched-Vosburg-Normanskill. The base can display 2 configurations. A shallow and broad corner notch, which produces a wide and expanding stem. This form can be confused with Brewerton Eared-Notched and can be distinguished by a longer stem in relation to the blade then Brewerton Eared-Notched Points, and the fact that technically Brewerton Eared-Notched are shallow side notched. The other displays a somewhat deeper corner notch with a broad expanding stem which however appears squat or short in relation to the blade. Here is the description with illustrations of both forms from Ritchie's New York typology:

The largest specimen, 2 1/2", is argillaceous slate, the remainder are quartzite:
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Argillite(argillaceous slate) Vosburg repurposed as a scraper:

Large Vosburg from eastern Ct. Photo and find by forum member flintmel: