Clastic dikes associated with pelitic folia and sediment-mxing structures in the Mettawee Slate Facies of the Bull Formation of Cambrian age, west-central Vermont, indicate that tectonic dewatering may have initiated slaty cleavage. Recrystallization, pressure solution, and large finite strains subsequently modified the initial planar anisotropy to give the slaty cleavage a predominantly metamorphic aspect.

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