If you have an ancestor who was buried in the "Louisville Cemetery" but no one can find a record or tombstone there, don't despair. They were probably buried in the Old Louisville Cemetry, now known as the Superior Cemetery.
This subject has come up before. But I just found in a file an old letter from a distant cousin. Hopefully this will provide some direction.
From : Dewey A. Dutton P.O. Box 306 Coupeville, WA 98239 19 Nov 1979
To : C David Knowles
"...David Carlton...[is] buried in Louisville ; David is not in the present cemetery , but one out in the country in a little used spot. I was taken to his grave as a young boy , several times [c.1905]."
I have obituaries from the "Boulder Camera" and recent email correspondence from Ms Polly Boyd (City of Louisville Department of Land Management BoydP@ci.louisville.co.us) that say the following three people were buried in the "Louisville Cemetery" but there is no record or tombstone for them in the "present" Louisville Cemetery. I therefore believe they are in unidentified graves in the Superior Cemetery.
Thomas Carlton 1824 - 28 Jan 1892 Jane (McLean) Carlton 1818 - 9 December 1891 Wife of Thomas David Carlton 17 November 1848 - 20 June 1892 Son of Thomas & Jane
Dewey A. Dutton was a grandson of David Carlton and I am a great-great-grandson of David Carlton.