The objective characterisation of sedimentary structures has not had as robust a development as more qualitative approaches. Using KRYNINE'S definition (1948, p. 145) that sedimentary structure is the “visible expression of non-uniformity in texture and composition”, a method is here developed that yields data which are a function of the thickness and orientation of the visually homogeneous elements that, juxtaposed, comprise a sedimentary structure. This method, based upon a progressive enlargement of the field of vision about a point until the included area is first non-uniform, yields a series of diameters which are related to both structural type and sampling plan. Exposures of sediment on a point-bar in the Mississippi River were studied in this manner and it was determined that the method efficiently discriminated between structural varieties, and additionally allows the structural complexity of a point-bar to be given a succinct quantitative description.