With the. In full "the Moine Series". An intensely folded series of metamorphic rocks in north-west Scotland and western Ireland, chiefly granulites and schists, which are thought to have been deposited in Precambrian (possibly Torridonian) times and metamorphosed later. In plural: the rocks themselves.
Late 19th century; earliest use found in Quarterly Journal of the Geological Society of London. From the name of A'Mhòine, an area east of Loch Eriboll in northern Sutherland, Scotland, where rocks of the series are exposed.