I travel with camera, so if there is a marker I'll take a picture of it. If not, I'll at least get a picture of the general area. I, too, have family in Calvary Cemetery in Queens - Ellen Raftery Kane (d 1903,her husband Tom and his second wife.I have no idea where in Calvary they are buried and they are far down on my list of folks to find.
Will let you know what I discover at St. Mary's.
Pat