A hill of compact, unstratified, glacial drift or till, usually elongate or oval, with the larger axis parallel to the former local glacial motion.
A low, rounded, elongate hill or ridge of compact till left by a glacier.
A streamlined, spoon shaped hill created by glacial deposition. The steep side of a drumlin faces in the direction from which the glacier came. The process that forms drift drumlins is still debated by glaciologists. The most popular explanation is that the pressure of the ice overriding existing moraines, drift, and till is sufficient to deform them and mold them into elongate ridges. They are steeper on the upslope side because that is where the greatest pressure is exerted by the flowing ice.