Indicators of ice movement direction. Often a series of terraces within a valley form steps on the valley sides. Terraces may be erosional or depositional. Thought to be an indicator of direction of ice movement when till was deposited. Both transverse and parallel fabrics commonly developed.
Regression is the opposite, the retreat of a feature from the land.
Such currents are dense, muddy suspensions produced on steep slopes in lakes or seas by slumping and sliding of soft sediment. Turbidites usually indicate conditions of rapid sedimentation in unstable environments. Glossary of botanical and geological terms . From the Institute for Arctic and Alpine Research, Colorado. Glossary of landforms and geologic terms .