There are three types of end moraine. Terminal moraines are the outermost end moraines of a glacier's advance, marking where it terminated. Recessional moraines are those left by retreating ice. Interlobate moraines are built between lobes of ice. Erratics are rocks carried from a distance in or on the ice.
Drumlins look like the upside-down bowls of teaspoons, or halves of teardrops.
Their formation is not well understood. They were built up in layers beneath moving glaciers and usually occur in groups sometimes in hundreds behind the end moraines. A drumlin's long axis parallels the glacier's direction of flow. To understand the changes continental glacial ice sheets brought, you must grasp their magnitude. Over thousands of years the cold of arctic climates crept southward.