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In page Drumlin:

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Drumlins are often encountered in drumlin fields of similarly shaped, sized and oriented hills. Many Pleistocene drumlin fields are observed to occur in a fan-like distribution.[2] The long axis of each drumlin is parallel to the direction of movement of the glacier at the time of formation.[3] Inspection of aerial photos of these fields reveals glacier's progress through the landscape. The Múlajökull drumlins of Hofsjökull are also arrayed in a splayed fan distribution around an arc of 180°.[4] This field surrounds the current lobe of the glacier and provide a view into the past, showing the previous extent and motion of the ice.[citation needed]