Editing Till (section)

===Depositional===
The sediments carried by a glacier will eventually be  [[Deposition (geology)|deposited]] some distance down-ice from its source. This takes place in the ''[[ablation zone]]'', which is the part of the glacier where the rate of ablation (removal of ice by evaporation, melting, or other processes) exceeds the rate of accumulation of new ice from snowfall. As ice is removed, debris are left behind as till.<ref>{{Citation|last=Goff|first=Paepin|title=Glacial depositional processes and landforms|date=2017|url=https://onlinelibrary.wiley.com/doi/abs/10.1002/9781118786352.wbieg1181|encyclopedia=International Encyclopedia of Geography|pages=1–7|publisher=American Cancer Society|language=en|doi=10.1002/9781118786352.wbieg1181|isbn=978-1-118-78635-2|access-date=2020-12-18}}</ref>{{sfn|Evans|2018|pp=6-9}} The deposition of glacial till is not uniform, and a single [[till plain]] can contain a wide variety of different types of tills due to the various erosional mechanisms and location of till with respect to the transporting glacier.<ref name=Hilt2002/>

The different types of till can be categorized between subglacial (beneath) and supraglacial (surface) deposits. Subglacial deposits include lodgement, subglacial meltout, and deformation tills. Supraglacial deposits include supraglacial meltout and flow till.<ref name=":0" /> Supraglacial deposits and landforms are widespread in areas of glacial downwasting (vertical thinning of glaciers, as opposed to ice-retreat. They typically sit at the top of the stratigraphic sediment sequence, which has a major influence on land usage.<ref name=Hilt2002>{{cite book|last1=Johnson |first1=W.H. |last2=Menzies |first2=John|chapter=10 - Supraglacial and ice-marginal deposits and landforms|date=1 January 2002 |chapter-url=http://www.sciencedirect.com/science/article/pii/B9780750642262500131|title=Modern and Past Glacial Environments|pages=317–333|editor-last=Menzies|editor-first=John|place=Oxford|publisher=Butterworth-Heinemann|language=en|isbn=978-0-7506-4226-2|access-date=13 May 2022}}</ref> Till is deposited as the [[terminal moraine]], along the [[Moraine#Lateral moraines|lateral]] and [[Moraine#Medial moraine|medial moraines]] and in the [[Moraine#Ground moraines|ground moraine]] of a glacier, and ''moraine'' is often conflated with ''till'' in older writings.{{sfn|Evans|2018|pp=129-135}} Till may also be deposited as [[drumlin]]s and [[Flute (glacial)|flutes]], though some drumlins consist of a core of stratified sediments with only a cover of till.{{sfn|Evans|2018|pp=123-124}} Interpreting the glacial history of landforms can be difficult due to the tendency of overprinting landforms on top of each other.{{sfn|Evans|2018|pp=149-151}}

As a glacier melts, large amounts of till are eroded and become a source of sediments for reworked glacial drift deposits. These include [[glaciofluvial deposits]], such as outwash in [[Outwash plain|sandurs]],{{sfn|Evans|2018|p=114}} and as [[Glaciolacustrine deposits|glaciolacustrine]] and [[Glaciomarine clays|glaciomarine]] deposits, such as [[varve]]s (annual layers) in any [[proglacial lake]]s which may form.{{sfn|Evans|2018|pp=117-118}} Erosion of till may take place even in the subglacial environment, such as in [[tunnel valley]]s.{{sfn|Evans|2018|p=114}}