There is another photo of his marker from a slightly different angle at the link below. Looks like some were double graves. I have a GGG Uncle there in a single grave. Apparently Camp Chase kept very good records of grave locations that enabled good permanent markers to be placed later.

http://www.findagrave.com/cgi-bin/fg.cgi?page=gr&GSln=Toler&GSiman=1&GScid=40165&GRid=75142076&