That dosent look like a quaker cemetery to me..usually quakers have very simple very small stones.....those are too big for quakers
There are some, but not the entire cemetery is Quakers. There are some more recent stones; I forget the exact years, but there were some late 1800's in there as well. Most of the Quaker stones are placed around the base of a tree.
There was a sign there with the cemetery's founding year, but it was taken down before my first visit.