overlap or are staggered in a line that runs obliquely to the strike of the individual features. Echelon faults and en echelon veins are examples. In sheet material response to shear stress it is typical for a series of echelon cracks to form. This is commonly seen in asphalt roads subject to shear stress imposed by aseismic fault creep. In mathematics, the term row echelon form refers to a kind of matrix where the non-zero elements are shaped in an echelon-like manner. In road bicycle racing, an echelon formation is a diagonal line of racers, which allows cooperative drafting in crosswinds. References Tactical formations Ornithology Structural geology