Knotted mica schist

What the map says

Biotite-rich schist that displays 3‒10 mm porphyroblasts or clots of metamorphic minerals that exhibit a lumpy or knotted outcrop appearance. Contains interbedded quartzofeldspathic mica schist (Xbq) and sparse, thin beds of granule-sized metaconglomerate Lithology: schist.

1:100,000 sheet: Workman and others, 2018, U.S. Geological Survey Scientific Investigations Map 3399 (3 crags). A contact line at that scale is about 100 m wide on the ground.

Characterized by porphyroblasts of staurolite and andalusite or by knots of sillimanite. Locally contains thin beds of granule to pebbly metaconglomerate and quartzofeldspathic schist

1:100,000 sheet: Colton, Roger B., 1976, U.S. Geological Survey Geologic Investigations Series I-855-G (1 crag). A contact line at that scale is about 100 m wide on the ground.

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