T-peg In geomorphology, a device for measuring the rate of surface creep. It consists of a metal rod to which a cross-piece is attached. The apparatus is inserted into the regolith and the cross-piece is levelled. Soil creep causes the cross-piece to tilt, and the degree of inclination is measured with a graduated spirit-level. The relative movement between the ground surface and the depth of insertion can then be inferred.

T-peg A device for measuring the rate of surface creep which consists of a metal rod to which a cross-piece is attached. The apparatus is inserted into the regolith and the cross-piece is levelled. Soil creep causes the cross-piece to tilt and the degree of inclination is measured with a graduated spirit-level. The relative movement between the ground surface and the depth of insertion can then be inferred.