You can see the Iapetus ocean forming between
North America, Amazonia and Baltica. This breakup also resulted in the creation of our Ottawa-Bonnechere Graben.
The graben also feeds into other lakes and bodies
of water in the St. Lawrence region, possibly even feeding two of the Great Lakes: Lake Erie and Lake Ontario.
Another contribution of the Ottawa-Bonnechere is
that of earthquakes as well as oil. Petroleum is sometimes found in these failed rifts which fill with sediment (also
called aulacogens), as the case of the North Sea basin near Britain. (Plummer et. all, 2007)
