http://collections.nysm.nysed.gov/pr...s/vosburg.html
See the first three figures here for examples of "squat" Vosburgs. The higher number figures here display the shallow and broad corner notching as do the the examples in the photograph below, from coastal New England.
http://collections.nysm.nysed.gov/pr...epoints/types/
The largest specimen, 2 1/2", is argillaceous slate, the remainder are quartzite:
Argillite(argillaceous slate) Vosburg repurposed as a scraper:


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