Till or glacial till is unsorted glacial sediment.

Till is derived from the erosion and entrainment of material by the moving ice of a glacier. It is deposited some distance down-ice to form terminal, lateral, medial and ground moraines.

Till is classified into primary deposits, laid down directly by glaciers, and secondary deposits, reworked by fluvial transport and other processes.

Processes

Glacial drift is the coarsely graded and extremely heterogeneous sediment of a glacier; till is the part of glacial drift deposited directly by the glacier. Its content may vary from clays to mixtures of clay, sand, gravel, and boulders. This material is mostly derived from the subglacial erosion and entrainment by the moving ice of the glaciers of previously available unconsolidated sediments. Bedrock can also be eroded through the action of glacial plucking and abrasion and the resulting clasts of various sizes will be incorporated to the glacier's bed.

Eventually, the sedimentary assemblage forming this bed will be abandoned some distance down-ice from its various sources. This is the process of glacial till deposition. When this deposition occurs at the base of the moving ice of a glacier, the sediment is called lodgement till. Rarely, eroded unconsolidated sediments can be preserved in the till along with their original sedimentary structures. More commonly, these sediments lose their original structure through the mixture processes associated with subglacial transport and they solely contribute to form the more or less uniform matrix of the till.

Tillé is a commune in the Oise department in northern France.

See also

References

ÖTILLÖ (Swedish for "Island to island") is a one-day swimrun race in the archipelago of Stockholm, Sweden. You compete in teams of two. The aim of the race is to get from Sandhamn to Utö, via 24 islands, by running across them and swimming between them. The total distance is 75 kilometres of which 10 km are open-water swimming and 65 km are trail-running. The first race was produced in 2006. The largest islands to run across are Runmarö, Nämdö and Ornö. In 2012 ÖTILLÖ was ranked as one of the toughest endurance challenges of the world by CNN.com. ÖTILLÖ is the first race and the origin to the growing movement of Swimrun. ÖTILLÖ is considered to be the World Championship of Swimrun even though it is not part of a federation.

ÖTILLÖ is produced by Michael Lemmel & Mats Skott (pre-marriage Andersson), former World Class Adventure Racers.

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