Well, maybe. To name one example, the Canadian Shield, though heavily eroded, has never been subducted. You can still find exposed Precambian rock there. To nam

Well, maybe. To name one example, the Canadian Shield, though heavily eroded, has never been subducted. You can still find exposed Precambian rock there. To name another, the Burgess Shale (also in Canada) contains fossils of some of the earliest known complex organisms.