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The exhumed deep crustal rocks in the Western Gneiss Region (WGR) of Norway experienced Caledonian high-pressure metamorphism during the Silurian, Scandian continental collision between Baltica and Laurentia. The record of coesite-bearing eclogites and pressure-temperature estimates from the WGR demonstrate extreme burial of these rocks at P_max. Eclogite tectonite fabrics record coaxial deformation characterized by bulk horizontal shortening and vertical stretching. Many eclogites, particularly those with a high content of kyanite, quartz, phengite and clinozoisite have constrictional fabrics related to vertical stretching. Fabrics that developed during orogenic extensional collapse are of two main types. The deepest exposed sections are dominated by penetrative coaxial fabrics that are characterized by vertical flattening and horizontal, E-W, stretching. These fabrics developed during rapid …