The giant impact theory predicts that Earth did, at one point, have a proto-ring of debris from the collision. That proto-ring slowly accreted into the moon. I

The giant impact theory predicts that Earth did, at one point, have a proto-ring of debris from the collision. That proto-ring slowly accreted into the moon. I'm not sure what evidence we would expect to observe on the moon to indicate whether it accreted from a proto-ring or was captured intact - could you elaborate a little?