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Composition and mode of cementation of some Cambro-Silurian grits in Wales are reported. The Cambrian grits are characterised by granitic and gneissic clasts ; the Upper Llandovery by rhyolitic and po...rphyritic fragments ; the Wenlock (Denbigh) grits by more basic volcanic materials. Nevertheless, there is no significant difference in the composition of clay cements, especially chloritic minerals. Clay cements of secondary origin play a minor role. GILBERT's classificatory scheme (1954) is, with some modification, reasonably applicable to the grits.show more
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18_02_p261