The photo on my link comes from an old photo album belonging to Martha (nee Benson) Newton (1844 - 1928), wife of Myron L. Newton and lifelong resident of Little Valley and the Town of Mansfield.

I leave it up to you to decide if this is the same person. I have been unable to find a Mary Pooseback in Ancestry.com and I have no knowledge about this person, other than she appeared in my great grandmother's photo album.

Good Luck,

Myron L. Newton, Jr.