Editing Till (section)

===Erosional===
Glacial till is mostly derived from subglacial [[erosion]] and from the [[Glacial motion|entrainment]] by the moving ice of previously available unconsolidated sediments. Bedrock can be eroded through the action of glacial [[Plucking (glaciation)|plucking]] and [[Abrasion (geology)|abrasion]], and the resulting [[clasts]] of various sizes will be incorporated to the glacier's bed.<ref name=Bendle2020/>

Glacial abrasion is the weathering of bedrock below a flowing glacier by fragmented rock on the basal layer of the glacier. The two mechanisms of glacial abrasion are striation of the bedrock by coarse grains moved by the glacier, thus gouging the rock below, and polishing of the bedrock by smaller grains such as silts. Glacial plucking is the removal of large blocks from the bed of a glacier.<ref name=Bendle2020>{{Cite web|last=Bendle|first=Jacob|date=10 May 2020|title=Subglacial erosion|url=http://www.antarcticglaciers.org/glacial-geology/glacial-landforms/glacial-erosional-landforms/subglacial-erosion/|access-date=25 November 2020|website=Antarctic Glaciers}}{{self-published source|date=May 2022|expert=y}}</ref>

Much of the silt in till is produced by glacial grinding,<ref name=Boggs2006/> and the longer the till remains at the ice-bedrock interface, the more thoroughly it is crushed. However, the crushing process appears to stop with fine silt. Clay in till is likely eroded from bedrock rather than being created by glacial processes.<ref name=Evans2018/>