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August 1835. On Friday, August 14th, the Reverend Profesor Adam Sedgwick and Mr. Roderick Impey Murchison (Figs. 1 and 2) read a communication to the final session of the Geology and Geography Section entitled "On the Silurian and Cambrian Systems, exhibiting the order in which the older Sedimentary Strata succeed each other in England and Wales." Sedgwick read the details of the Cambrian rocks as established by his research, whilst Murchison discussed the basis for his Silurian stratigraphy; this presentation, by the seemingly unlikely combination of a Cambridge University prof essor/clergyman and an ex-soldier turned amateur geologist, was the first announcement at a formal scientific meeting of the terminology and relationships of the major stratigraphical units that were to become accepted universaly as the lower and upper divisions of System rank within the Lower Palaeozoic rocks. Formative Studies

'Transition Rocks and Grauwacké' - The Silurian and Cambrian Systems through 150 Years