Hundreds of petroglyphs are etched on a slab of crystalline limestone about 180-by-100 feet (a third the size of a football field) in Peterborough, Canada. They may have been left by Algonquin Native Americans about a thousand years ago, or by Scandinavian traders a few thousand years ago. The latter claim flouts the common understanding of history, which places Europeans in the New World much later. But it has had a few prominent supporters.
They say that the depictions of animals, solar symbols, geometric shapes, boats, and human figures on the so-called Peterborough Stone reflect a style used in the Old World.
A large ship was drawn in a style common in Scandinavia.
