Rev. Br. Irving — On the Younger Red Rocks. 



367 



deposits (the breccia-sandstone series), claimed by the German 

 writers for their area, is found to be equally true for the West 

 Midlands and for Devonshire ; but my work has led me (as my 

 papers show) to recognise terrestrial deposits in them to a greater 

 extent than our German confreres have done. 



To a geologist familiar with the Permian of Notts, there is little 

 difficulty in recognising the great red-marl series of Devon west of 

 the Aylesbeare line of hills, as replacing homotaxially the marine 

 Ma^nesian Limestone of the northern area ; since in Notts the two 



^/^r 



Fig. 1.— Coast-section at Saltern. Cove (Tor Bay), Devon, showing unconformity of 

 Permian breccia-sandstones with the Lower Devonian. 



A Breccias and tliin beds of irony sandstone. 



B Lower Devonian slates with bands of quartzite, intersected by quartz veins. 



Fig. 2. — Railway section at Kiraberley, Notts, showing unconformity of Upper 



Permian (Magnesian Limestone and Marl Slate) with the Coal-measures. 

 A Magnesian Limestone. B Marl Slate. C Breccia. D Coal-measures. 



are bound together by the closest of all ties — interstratification. 

 And the marls of the two areas are identical in character. That 

 they are the finer washings-out from the coarser detritus, and the 

 sediments thrown down along with the chemically -precipitated 

 peroxide of iron (to which they owe their prevalent colour) in 

 shallow enclosed basins, is to me the most probable theory as to 

 their origin ; and there would appear to be no serious objection to 

 the view which regards them as the " Continental " equivalents of 

 marine Magnesian Limestone of the North of England and the 

 marine Zechstein of Germany, with both of which such marls are 

 intimately associated. 



