. Bulletin of the British Museum (Natural History), Geology. ORDOVICIAN-SILURIAN JUNCTIONS IN S.W. SCOTLAND 49 sedimentary structures, palaeoenvironmental analysis of the High Mains Formation is equivo- cal. Nevertheless the thickness, geometry and lithology of the unit are compatible with deposi- tion within channels which developed on the deeper parts of the shelf and the upper parts of the slope. Such environments (Dott & Bird 1979) may be characterized by apparently massive and structureless sandstones comprising channel fills in the order of 25 m thick. Elsewhere, various modes of cha
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. Bulletin of the British Museum (Natural History), Geology. ORDOVICIAN-SILURIAN JUNCTIONS IN S.W. SCOTLAND 49 sedimentary structures, palaeoenvironmental analysis of the High Mains Formation is equivo- cal. Nevertheless the thickness, geometry and lithology of the unit are compatible with deposi- tion within channels which developed on the deeper parts of the shelf and the upper parts of the slope. Such environments (Dott & Bird 1979) may be characterized by apparently massive and structureless sandstones comprising channel fills in the order of 25 m thick. Elsewhere, various modes of cha