Editing Drumlin (section)

==Occurrence==
Drumlins and drumlin swarms are glacial landforms composed primarily of glacial [[till]]. They form near the margin of glacial systems, and within zones of fast flow deep within [[ice sheet]]s, and are commonly found with other major glacially-formed features (including [[tunnel valley]]s, [[esker]]s, scours, and exposed bedrock [[erosion]]).<ref name=shaw1984>{{Cite journal | last1 = Shaw | first1 = J. | last2 = Kvill | first2 = D. | title = A glaciofluvial origin for drumlins of the Livingstone Lake area, Saskatchewan | journal = Canadian Journal of Earth Sciences | volume = 21 | issue = 12 | pages = 1442–1459 | year = 1984 | doi = 10.1139/e84-150|bibcode = 1984CaJES..21.1442S }}</ref>

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.<ref>{{cite journal | last1 = Patterson | first1 = C.J. | last2 = Hooke | first2 = R.L. | year = 1995 | title = Physical environment of drumlin formation | journal = Journal of Glaciology | volume = 41 | issue = 137| pages = 30–38 | bibcode = 1995JGlac..41...30P | doi = 10.1017/S0022143000017731 | doi-access = free }}</ref> The long axis of each drumlin is parallel to the direction of movement of the glacier at the time of formation.<ref>{{cite journal|last1=Spagnolo|first1=M.|last2=Clark|first2=C.D.|last3=Hughes|first3=A.L.C.|last4=Dunlop|first4=P.|last5=Stokes|first5=C.R.|year=2010|title=The planar shape of drumlins|journal=[[Sedimentary Geology (journal)|Sedimentary Geology]]|volume=232|issue=3–4|pages=119–129|bibcode=2010SedG..232..119S|doi=10.1016/j.sedgeo.2010.01.008}}</ref> 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°.<ref name=B/> 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|date=July 2021}}