There is still a large section of Confederate graves at Gettysburg...And marked as such....
“There is still a large section of Confederate graves at Gettysburg...And marked as such....”
I thin you might be thinking of a different battlefield. At Gettysburg there are no marked Confederate graves remaining. Over 3000 Confederate dead were removed in the summer of 1872 and more before and after that.
Crews were pretty diligent in removing all the Confederate dead that could be located from the battlefield and field hospital sites and shipping them to southern cemeteries for reinternment. There are undoubtedly some Confederate still buried on the field in unmarked graves. The last human remains found were at the Railroad Cut on the 1st days battlefield. These remains were found in 1996 but it could not be determined if they were Union or Confederate and they were interred in the National cemetery as “Unknown Civil War Remains”.
There are at least two Confederates buried in the National cemetery but they were misidentified as Federal soldiers.