The skin on his arms had become dry and flaky, as if his body were preparing itself to rejoin the earth… He asked for the bag. I was shocked at what he took from it.
The skull of the Paleocene rodent.
"This is home," he said (33.13-17).
In this scene a much older Archie is burying the skull of Barney in a rock. He tells the skull that he is home, because he is back in the earth, where he came from. So instead of leaving earth for heaven when we die, Stargirl suggests we return to it.