Abstract

Measurements combining axial ratios and long-axis orientations of undeformed objects have shown significant departures from theoretical predictions as to the possible types of postcompaction, pretectonic sedimentary fabrics. More importantly, some plot patterns are not unique to one sedimentary distribution, which means that when this technique is applied to strain analysis, at least two possibilities are found for the finite strain and its orientation on a single analyzed surface. This work stresses the need to investigate all initial situations comparable to the deformed examples under consideration. Also, because of the complex starting point of oolite, pebble, quartz grain, and similar strain analyses, it appears impossible to make accurate statements from such studies about the relationship of the finite strain ellipsoid to cleavage. Hence, the Elliott technique is considered to have been misused when employed to suggest that cleavage in “slaty” rocks is not strictly relatable to finite strain.

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