White Chimney Cemetery is in Stuart, Oklahoma. Stuart must be on the edge of Pittsburg and Hughes Counties, as one site lists Stuart in Hughes Co., and one site lists it in Pittsburg.
(White Chimney Cemetery is located 2 miles east and 1 1/2 miles south of Stuart, Oklahoma, in Pittsburg County.)
I found this site that had White Chimney Cemetery burial listings.I found Laura Hamilton on this site. This is your Marcus, I believe, only listed as D. Hamilton. He may have gone by his middle name, seen this a lot in genealogy records.
Hamilton, D., b. 06-06-1879, d. 04-15-1931 Hamilton, Laura, b. 04-12-1889, d. 04-24-1973