To explain the distribution of certain modern halophytic plants on the shores of James Bay, Potter advanced the idea of a post-Pleistocene marine connection between James Bay and the St. Lawrence drainage; he placed his seaway between Lake Timiskaming and James Bay. Potter's route is considered improbable because of geological and paleontological objections, which are discussed in detail. Another route, between Lake St. John and James Bay, is advocated and arguments advanced to show that it is not open to the objections against the route chosen by Potter.

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