364 Rev. D. Williams on Volcanic interferences. 



book of Nature, will never enable us to attain the truth or a 

 right conclusion. True it is, that the Silurian Orthides of 

 of Gorran and elsewhere, in their expressive silence, pro- 

 claim the hypotheses of " azoic and protozoic formations and 

 strata identified" in danger, as loudly as the Scottish fish 

 and fossils ; while the Devonian Trilobites in the same hand- 

 specimens of Mr Peach, and the long array of witnesses in 

 my possession from the same range of beds, very sadly de- 

 preciate and damage a case which it is attempted to sustain 

 on the evidence of those few Orthides alone. 



According to my views, therefore, from the north of Scot- 

 land to the south of Devon and Cornwall, we have an extend- 

 ed and continuous series of detrital and volcanic-sedimentary 

 and crystalline deposits, if we strip off the mountain-limestone 

 imposition, which is demonstrably no part of such continuous 

 series ; the geographical progression being in truth depend- 

 ent on, and coincident with, the uninterrupted geological suc- 

 cessions. The older red of Scotland never can be separated 

 or detached from its associated volcanic products, as may be 

 seen from the Lammermuir hills to the Mull of Galloway, 

 and in Cumberland and the Isle of Man ; and these are con- 

 fessedly as subordinate to the Silurian, as I am prepared to 

 prove the Silurian or old red is inferior to the Ocrynian. — 

 Annual Report for 1848, of Boyal Geological Society of Corn- 

 rcall. 



