Today it is generally agreed that glacial flow caused the lineations. Commonly developed features include transposition foliations, lineations, stylolites, folds, and reverse faults. Today, it is generally agreed that glacial flow caused the lineations. Lineations in structural geology are linear structural features within rocks. L to differentiate them from intersection lineations, though this is generally redundant. In these zones, the lineations are between horizontal and vertical. Intersection lineations can also be due to the intersection of two foliations. Stretching lineations are formed by shearing of rocks during asymmetric deformation of a rock mass. Intersection lineations are measured in relation to the two structures which intersect to form them. Microstructural evidence of transtension includes rodding or stretching lineations, stretched porphyroblasts, mylonites, etc. Lineations are measured in terms of dip and dip direction, if possible. Often lineations occur expressed on a planar surface and can be difficult to measure directly.