SummaryAssemblages of calcareous foraminifera and algae have been examined in thin sections of Dinantian limestones from the Skipton, Broughton, Hetton, Eshton, Swinden and Lothersdale anticlines in the Craven Lowlands. Provisional identifications are listed for each assemblage and a correlation of the rock successions is suggested. The assemblages range from late Tournaisian to late Viséan in age, in terms of the Belgian divisions, and from Courceyan to Asbian in terms of the new chronostratigraphic stages of George et al. (1976).
SummaryNew work on the sedimentology and palaeontology of the classic area of the ‘basinal’ facies of the Carboniferous Limestone requires that a formal lithostratigraphic framework be established to rationalize the existing system of local rock units and regional lithofaunal ‘groups’ and ‘series’. Five formations, based on the existing ’groups‘ in the Clitheroe area, are defined for the whole Craven Basin outcrop. They are, from the base, the Chatburn Limestone Formation, the Clitheroe Limestone Formation (which includes the ’reef-knolls’ of the Clitheroe area), the Worston Shale Formation, the Pendleside Limestone Formation (to include the knolls of the Craven reef belt) and the Bowland Shale Formation. The chronostratigraphy, in terms of the six British Dinantian Stages, and a provisional micropalaeontological biostratigraphy are outlined.
Time-correlation among palaeontological samples or other items of geological information located in measured sections can be depicted graphically as a network, in which the samples, represented by points, are linked by arrows, each of which represents a decision as to which of the samples linked is the older and which the younger. The idea of a correlation network stems naturally from the concept of correlation as a process of ordering, not equating, items of geological information in time. Examples of correlation networks are presented for a palynological reconnaissance of Triassic-Jurassic sections in eastern Svalbard, and for correlation of Lower Carboniferous sections in North Yorkshire based on calcareous microfossils.
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