The Civil War Prisons Message Board

Alton Confederate cemetery

I have found out one of my relatives buried at Alton. I found a transcription at http://www.interment.net/data/us/il/madison/naltoncf/index.htm

Is this a mass grave? I notice all of the plots have the same numbers. The bodies appear to have been moved in 1867 why? Is there any individual headstones in this cemetery?

Thanks,
GP