The Geological Conservation Review series of volumes provides much useful and important information concerning British rock sequences and their fossils. The present volume is timely in that there is current great interest in the Carboniferous. The title emphasizes the changing nature of our studies of the Carboniferous. In Britain we have traditionally divided the Carboniferous into Lower and Upper (lately equating this to Dinantian and Silesian). However recent international agreements divide the Carboniferous into Mississippian and Pennsylvanian, and the two two-fold divisions do not exactly equate. The summary chronostratigraphical classification figure includes the lowest two stages of the Namurian into...

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