Your Arca and Mary match up nicely with several charts I have. Archelaus Walling had a large family in Hartford, NY (Archelaus was born in RI) Several sons moved to northern NY. One son; Samuel W. Walling m. Alice Payne ch. all born in Gouveneur, NY 1. Asaph b. 1816 2. Arca d. 1873, m. Mary___ 3. Eliza 4. Moses
It also lists first child of Arca and Mary as Morrell who married in 1847, no name listed.
I have quite a bit on this family going back from Samuel which I can send. Too much for a late night querry hit.