Page "Henry Carvill Lewis" Paragraph 2

During the winters of 1885 to 1887 he studied petrology under HF Rosenbusch at Heidelberg, and during the summers he investigated the glacial geology of northern Europe and the British Isles.

His observations in North America, where he had studied under Professor G. F. Wright, Professor T. C.

Chamberlin and Warren Upham, had demonstrated the former extension of land-ice, and the existence of great terminal moraines.