Plate 1. Selected key textural relationships in the high-grade schist. 1. D2 fold in a biotite-rich high-grade schist. Sillimanite and biotite define S2 parallel to the axial surface of the fold. Note on the lower left corner the early plagioclase porphyr

Plate 1. Selected key textural relationships in the high-grade schist. 3. Large plagioclase porphyroblasts (P) with straight graphitic inclusion trails, suggesting plagioclase growth between D₁ and D₂ (plagioclase I). Sheaves of fibrolitic sillimanite (S) and oriented biotite porphyroblasts (B) define the S₂ foliation. Sample 161-976B-77R-2, 40-44 cm. Plane-polarized light. Scale bar is 500 µm.