Well, I certainly don’t consider myself the be all or end all on Northeastern types. Most of the cherts that show up in Ct., and southern New England in general, will be Hudson Valley cherts. Almost always actually, except for jasper, which can be either from Pa., or from RI.
As for type, like yourself, I might lean Atlantic phase blade. But we should keep in mind Atlantics are considered an eastern correlate of the Snook Kill point. If found in eastern Ct., collectors might call it an Atlantic. But in western Ct., collectors there might know it better as a Snook Kill point. Need not be a coastal find, just as common in the interior.
My best guess…..