"In the schistose grits of the Dalradian series north of Stonehaven there is clear evidence of the deformation of the rock by shearing of the original quartz grains along planes roughly diagonal to the 'flattening', which here coincides generally with the schistosity of the quartzschist, the final product of the metamorphism. . . . It is suggested that any theory that makes a purely mechanical reaction of the quartz grains to the deforming forces the dominant factor in the production of a new texture is at variance with the facts since there is clear evidence of the continued solution and crystallization of quartz throughout the whole of the metamorphic period."

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