BRUCS: a new system for classifying and naming mappable rock units

A new scheme is introduced for classifying and naming mappable rock bodies that lack primary stratification. In recognition of their distinctive geological characteristics, these ‘nonstratiform’ are defined classified according to 3D form, spatial distribution genetic relationships, in two hierarchical (parent–child) chains: one intrusions tectonometamorphic units. Geologically complex units, encompassing different classes, a third chain reserved specifically ‘mixed-class’ The classification offered as an alternative existing recommendations the International Stratigraphic Guide North American Code, which nonstratiform recognized primarily by lithological character. BRUCS (the BGS Rock Unit Classification System ) combines three parent–child chains units with well-established stratiform (bed–member–formation–group–supergroup) create flexible, practical effective solution all bodies. taxonomic rigour means considerable capabilities modern digital systems managing communicating mapping data can be exploited fully.