Our Diverse Prairie Landscape: Saskatchewan is Not Just Flat! Glacial Terminology
The Layered Earth
Evidence of Ohio's Glaciers | Ohio Department of Natural Resources
What is the difference between an esker and a drumlin? - Quora
Mike Wetherley on Twitter: "Eskers were long claimed to be river courses flowing beneath icecaps. They formed from sediment washed up against broken blocks of ice. (see my Tweet on Drumlins) They