. . "From 10 thousand to 2 million years ago" . . . "Pleistocen marine submergence of the Hudson, Champlain and St. Lawrence Valleys"@en . . . . . . . . . . "Pleistocene marine submergence of the Hudson, Champlain and St. Lawrence valleys" . "Pleistocene marine submergence of the Hudson, Champlain and St. Lawrence valleys"@en . . . .