The Neoproterozoic Katangan R.A.T. (‘‘Roches Argilo-Talqueuses’’) Subgroup is a sedimentary sequence composed of red massive to irregularly bedded terrigenous-dolomitic rocks occurring at the base of the Katangan succession in Congo. Red R.A.T. is rarely exposed in a continuous section because it was affected by a major layer-parallel de´collement during the Lufilian thrusting. However, in a number of thrust sheets, Red R.A.T. is in conformable sedimentary contact with Grey R.A.T which forms the base of the Mines Subgroup. Apart from the colour difference reflecting distinct depositional redox conditions, lithological, petrographical and geochemical features of Red and Grey R.A.T. are similar.

All genera and subgenera of fossil and living brachiopods described from 1775 to 1979 are listed with comments on their current nomenclatural status. A computerized list presents all valid brachiopod genera (and subgenera), including subjective synonyms, with additional information regarding type-species, superfamily classification, and range (by period) of each genus. A bibliography supplements both lists

This report has been reviewed in draft form by individuals chosen for their diverse perspectives and technical expertise, in accordance with procedures approved by the National Research Council’s Report Review Committee. The purpose of this independent review is to provide candid and critical comments that will assist the institution in making its published report as sound as possible and to ensure that the report meets institutional standards for objectivity, evidence, and responsiveness to the study charge. The review comments and draft manuscript remain confidential to protect the integrity of the deliberative process. <...>

Metamorphism is broadly a process of solid-state change in the mineralogy, texture and chemistry of rocks in the Earth's crust. It provides a powerful record of change in the Earth's most active settings where metamorphism has proceeded in response to global tectonics.