TY - CONF T1 - A ploughing model for the origin of weak tills beneath ice streams: a qualitative treatment JO - QUATERNARY INTERNATIONAL PY - 2001/01/01 AU - Tulaczyk SM AU - Scherer RP AU - Clark CD ED - VL - 86 SP - 59 EP - 70 Y2 - 2024/12/22 ER -