Mary was born before 1680. She and William York were married by the Reverend James Noyes Dec 18, 1695.
Sources
"Connecticut, Vital Records, Prior to 1850," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:QP7G-V3CP : 21 September 2019), Mary Alley in entry for William York, 18 Dec 1695; citing Marriage, Stonington, New London, Connecticut, British Colonial America, Compiled by Lucius A. and Lucius B. Barbour, housed at State Library, Hartford, Connecticut; FHL microfilm 008272251
Statistics of the first congregational church Stonington , Connecticut
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DNA Connections
It may be possible to confirm family relationships with Mary by comparing test results with other carriers of her mitochondrial DNA.
However, there are no known mtDNA test-takers in her direct maternal line.
It is likely that these autosomal DNA test-takers will share some percentage of DNA with Mary: