Debbie - The mountains along the NY/MA border are generally called the Taconics. I am not aware of an individual one called "Taconic" or any of the various spellings. The "mountain west Sheffield" is presently called Mount Everett. To the west of that is the part of New York that is called "Taconic" or "Tagkhanic" or various other spellings. During the time you are talking about, the location of the border between NY and MA was in dispute, so you cannot assume that the land in question is still in Massachusetts. I think it is notable that you have two obviously Dutch names in the deed. This gives me a hint that the land is actually in NY now. I recommend that you make inquiries on the Columbia County list. Hallenbeck/HallenbeekHollenbeck etc. was a pretty common name there and you might find a connection. In a message dated 11/25/2001 6:57:55 PM Eastern Standard Time, dldove@earthlink.net writes: << I've recently come across a deed dated with several family members in it which mentions a Taconic Mountain (spelled different ways). There is not a Taconic Mountain on the map these days. I suspect it was renamed. Does anyone know what mountain it might be? I include the section from the deed. on the Township that was lately Sold at Tahconock, to John Halenbeek and others East on the Top of the first great ledge of the mountain west of Sheffield and of the house of John Van Gilder called the Takcannock mountain Thanks very much. Debbie Winchell >>