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Grenvillian gneiss (foliated, lineated) cross-cut by a vein of chlorite and quartz. Elsewhere in the outcrop, the gneiss is cross-cut by two substantial feeder dikes of meta-basalt (now greenstone; GigaPan: gigapan.com/gigapans/185681).
Chlorite crystal fiber lineations from within the Brallier Shale near Paw Paw, WV. To explore the outcrops where these slickensides can be found, click here: www.gigapan.com/gigapans/112956 Or here: www.gigapan.com/gigapans/112957