Recalling the discussions on the limited ranges of the lengths and spacings of pressure solution seams, it follows that pressure solution seams are highly segmented and those segments close to each other are arranged echelon. Figure 1 is a photograph of an array of pressure solution seams with shorter lengths and narrow spacings on a cut and polished surface of a building stone out of the Indiana Limestone on the walls of one of the buildings at Purdue University, Indiana. Some of the seams had linked, but many closely spaced seams are still unlinked. Figure 2 shows trace maps of arrays of echelon pressure solution seams in various scales in limestone.

Figure 1. An array of pressure solution seams showing the discontinuous nature of short segments and their echelon arrangements on the cut and polished surface of the Indiana Limestone.

Figure 2. Trace maps showing arrays of pressure solution seams in various scale with linked and unlinked echelon segments in the Selinsgrove Limestone Member of the Onandaga Formation cropping out in the Valley and Ridge Province, central Pennsylvania. Slightly rearranged from Mardon (1988).