lodgment till

lodgment till
   A subglacial till deposited by an active glacier (flowing ice) commonly characterized by dense, fissile (“platy”) structure and containing rock fragments with their long axes oriented generally parallel to the direction of ice flow. Local bedrock generally dominates the rock fragment composition and fragments exhibit striations or facets.
   SW & GG

Glossary of landform and geologic terms. 2013.

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  • 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

  • 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

  • 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

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  • ground moraine —     a) Commonly an extensive, low relief area of till, having an uneven or undulating surface, and commonly bounded on the distal end by a recessional or end moraine.     b) A layer of poorly sorted rock and mineral debris (till) dragged along,… …   Glossary of landform and geologic terms

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