’ Presidential Address—The Geology of Devon. 511 
It would be beyond the limits of a Presidential Address if I were 
to follow this very interesting subject much further on the present 
occasion. I hope to have demonstrated that considerable progress 
has been made with the Devonian question during the last twenty 
years, although, as stated by Mr. Whidborne, in his preface to the 
“Devonian Fauna of the South of England,” the correlation of the 
different parts of the system with the major divisions in America 
and the Continent is still a matter of discussion. Crumpled up and 
reversed as the beds are in South Devon, their stratigraphy will 
always be complex; but it is probable that in their original condition 
there was considerable resemblance to the Rhenish and Belgian 
Devonians, pointing to the prevalence of fairly similar conditions 
during the period of deposition. 
_ Referring to the subject of correlation with Continental beds, there 
is an article in the “ Neues Jahrbuch” for the present year ‘“‘On the 
Devonian of Devonshire and the Boulonnais,’ writted by Herr 
Kayser, which, he says, is the outcome of a trip to the South-west 
after the Geological Congress of last autumn. 
Herr Kayser | finds in South Devona development which intimately 
approaches the West-German. In the Upper Devonian of that 
region he recognizes nodular limestones with Clymenia (more 
typically developed at South Petherwin), ‘“ Cypridinen-schiefer,”’ 
Adorf Goniatite-limestone, Btidesheim-shales, and Iberg Coral- and 
Brachiopod-limestones. In the Middle Devonian he recognizes 
Stringocephalus-limestone, Calceola-limestone, Calceola-shales, and 
possibly also Goslar-beds. In the Lower ‘Devonian he finds the 
Upper and Lower Coblenz stages and ‘“ Siegen-Grauwacke ” 
especially represented by a small but typical fauna at Looe. This 
general agreement is further increased by the appearance of numerous 
‘“oreenstones,” which, just as in Nassau and the Harz, are accom- 
panied by schalsteins. 
He notes the difference of development in North Devon. In the 
Upper Devonian the Clymenia-limestone, the Adorf Goniatite-lime- 
stone, and the Iberg coral-limestone are missing. In the Middle 
Devonian he notes the absence of the great Stringocephalus- and 
Calceola-limestones of South Devon. The Lower Devonian of this 
area, with its preponderance of hard quartzitic sandstones and 
grauwackes, does not for the present permit of any close comparison 
with the Rhenish or Belgian-French Devonian. He recognizes the 
horizons of the Pilton beds and of the Cucull@a-zone, or Baggy beds, 
which seem to have their Continental analogues rather in Belgium 
than on the Rhine, but there is nothing in those countries to represent 
the Pickwell-Down Sandstone. So likewise the phyllitic shales of 
Morte and Ilfracombe, which alone represent the whole Middle 
Devonian of North Devon, are equally without analogues. 
From the above we may fairly conclude that the North-Devon 
beds have very little in common with the Devonians on the Conti- 
nent. But it is mainly through the North-Devon Beds, as we have 
already seen, that the Devonians generally can be made to fit in 
with the two members of the Old-Red Sandstone. Both geographi- 
eally and.in character the North-Devon beds occupy an intermediate 
