GEOLOGY & PLANETARY SCIENCE A  B  C  D  E  F  G  H  I  J  K  L  M  N  O  P  Q  R  S  T  U  V  W  X  Y  Z                    HOME ABOUT CATEGORIES SITE MAP COPYRIGHT ADVERTISE CONTACT entire Web this site till The surface of the ground in this area adjacent to Sherman glacier is covered with a coarse glacial till. Chugach Mountains, Chugach National Forest, Alaska. Credit: USGS Also known as boulder clay, the unsorted material left behind on the land after the retreat of a glacier. Till is a heterogeneous mixture of different sized material deposited by moving ice (lodgement till) or by the melting in-place of stagnant ice (ablation till). After deposition, some tills are reworked by water. See also drift, drumlin, moraine. Related category    • GEOLOGY AND PLANETARY SCIENCE Source: USGS Also on this site: Encyclopedia of Alternative Energy & Sustainable Living Encyclopedia of History Transport Concepts & Designs (partner site) BACK TO TOP