Hi again, I don't have more info. on Susanna Tallman except that her Ancestral File Number (AFN) at the Mormon Family History Center is: NKMR-WM. My printout of the family group record for her father in law, Matthew, (AFN 8LG2-D9)under Joseph's info. has: Joseph b. 1653 at New London, New London, CT.. CHR. same year and same place. Died 1707/1708 at Lyme,,CT.. Spouse: Susanna, and 2 others. My direct line is from Nathaniel who was your Joseph's next younger brother. The info. still needs to be verified by you since I have not verified it myself.
Have you tried using keyword and typing in New London and Conn.? You might be able to find genealogy info. on the town that way.
If you respond to this message please do it by direct e-mail and put Beckwith in the subject line.
Hope this helps in your research. If I come up with more info. I will send it along to you.