Glossary of landform and geologic terms. 2013.
till — [ glacial ] Dominantly unsorted and unstratified drift, generally unconsolidated and deposited directly by a glacier without subsequent reworking by meltwater, and consisting of a heterogeneous mixture of clay, silt, sand, gravel, stones,… … Glossary of landform and geologic terms
Till — is unsorted glacial sediment. Glacial drift is a general term for the coarsely graded and extremely heterogeneous sediments of glacial origin. Glacial till is that part of glacial drift which was deposited directly by the glacier. It may vary… … Wikipedia
Supraglacial lake — A supraglacial lake is any pond of liquid water on the top of a glacier. Although these pools are wict|ephemeral, they may reach kilometers in diameter and be several meters deep. They may last for months or even decades at a time, but can empty… … Wikipedia
subglacial till — Till deposited beneath, in, or by the bottom part of a glacier or ice sheet; subglacial till types include lodgment till, subglacial flow till, and subglacial melt out till. Compare: till and supraglacial till. SW & GM … Glossary of landform and geologic terms
supraglacial flow till — refer to flow till … Glossary of landform and geologic terms
supraglacial melt-out till — refer to melt out till … Glossary of landform and geologic terms
supraglacial — Carried upon, deposited from, or pertaining to the top surface of a glacier or ice sheet; said of meltwater streams, till, drift, etc. GG … Glossary of landform and geologic terms
supraglacial debris-flow sediment — (not preferred) refer to till … Glossary of landform and geologic terms
flow till — A till that may be either subglacial or supraglacial in origin. Flow till displays secondary transport, sorting, and/or fabric modification by plastic mass flow. Flow till exhibits weak stratification and sorting and may contain distorted… … Glossary of landform and geologic terms
melt-out till — A till that may be either subglacial or supraglacial in origin. Melt out till forms by slow melting of debris rich stagnant ice, but without secondary flow processes. The fabric and clast orientations, imparted by ice processes, remain mostly… … Glossary of landform and geologic terms
