...rivers that flowed in tunnels under the ice, and whose courses were paved with sand and gravel. * * * * The dove-tailing and interosculation of boulder-clay...arched over subglacial lakes, so that accumulation of ground moraine proceeded side by side with the formation of aqueous sediments. * * * » Now a study...

...any evidence of marine action. On the contrary, the dove-tailing and interosculation of Houlder-clay with aqueous deposits are explained by the relation...was tunnelled by rapid streams and rivers, and here ami there it arched over sub-Glacial lakes, so that accumulation of groundmoraine proceeded side by...

...rivers that flowed in tunnels under the ice, and whose courses were paved with Hand and gravel. * * * * The dove-tailing and interosculation of boulder-clay...aqueous deposits are explained by the relation of the ico to the surface over which it flowed. Throughout the peripheral area it did not rest so continuously...