Metamorphic assemblages from the vicinity of a thrust in the Sikkim to Darjeeling area of the Himalayas contain some of the following minerals: quartz, plagioclase, epidote, sericite, lawsonite, chlorite, stilpnomelane, aragonite, phengite, and pumpellyite. Textural relationships suggest that stilpnomelane replaces pumpellyite and that both of these minerals are replaced by epidote. The assemblage lawsonite-quartz-aragonite appears to have been stable and indicates that a moderate- to high-pressure metamorphism developed coevally with the thrusting. The rocks involved are Proterozoic but it seems likely that the thrusting was Tertiary. The metamorphism associated with the thrusting may have outlasted a more general Tertiary metamorphism or may have been superimposed on a Precambrian event. Either way this is unusual for in general the stratigraphic age of rocks involved in such tectonic zones is not much greater than the age of the metamorphism.