Mary was born in 1838. Mary Bryanton lived and farmed in Spring Valley, PEI, Canada. She passed away in 1889. 
She's buried at St. Stephens Cemetery, Burlington, PEI
Some sources cite her mother to be Mary Ann Stone. I'm still diligently working on this! If anyone has a direct source I would love to hear from you.
From the BAP (Baptismal Record) there are these two births recorded: John Bryanton Maria Brown Bryanton, Mary Jane born 1 November 1838 baptized 17 February 1839 and John Bryanton Mary Ann Stone Bryanton, Jane 24 April 1836
"Canada Census, 1881," index, FamilySearch (https://familysearch.org/pal:/MM9.1.1/MVN7-V5G : accessed 18 Nov 2014), Mary J. Casely in household of John Caseley, Lot 18, Prince, Prince Edward Island, Canada; citing p. 47; Library and Archives Canada film number C-13162, Library and Archives Canada, Ottawa, Ontario; FHL microfilm 1375798.
http://www.stonehouse.ca/tree/p925.htm Mary Jane Bryanton was born on 1 November 1838 at Spring Valley, Prince, Prince Edward Island, Canada, 46.500170~-63.626880. She was the daughter of John Bryanton and Maria Brown. She married John Caseley on 11 February 1863. Mary Jane Bryanton died on 1 October 1889 at Spring Valley, Prince, Prince Edward Island, Canada, 46.500170~-63.626880, at age 50. She was buried after 1 October 1889 at St Stephens Cemetery, Burlington, Prince Edward Island, Canada. Children of Mary Jane Bryanton and John Caseley
Catherine Jane Bryanton+ b. 14 Mar 1861, d. 15 Jul 1945 William Henry Caseley+ b. 14 Aug 1863, d. 1937 Charles Caseley+ b. 1865, d. 1954 Mary Isabelle Caseley+ b. 1867, d. 7 Jan 1938 Annie Caseley b. 1870, d. 1934 Zetilla Caseley+ b. c 1872, d. 1958 Barbara Ann Caseley b. Jul 1872, d. 29 May 1877 Maude Caseley b. 1875 Cecil Caseley+ b. 1887, d. 1970
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