Petrofabric study of Conestoga limestone from Hanover, Pennsylvania

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Abstract
The study applies established techniques of calcite petrofabric analysis to a low-grade metamorphic, sandy-textured, carbonate rock. Prominent features of the fabric are overall monoclinic symmetry, post-crystalline late phase orthorhombic symmetry, and ac girdles perpendicular to megascopic fold axes. The fabric results from differently oriented episodes of orthorhombic movement the axes of which rotated through the rock during deformation. Compression axes causing late phase deformation are in the ac plane in zones approximately bisected by the normal to slaty cleavage.

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