TPIE 



GEOLOGICAL MAGAZINE. 



NEW SERIES. DECADE IV. VOL. VII. 



No. IV.— APRIL, 1900. 



I. — Notes on the Geology and Fossils of some Devonian 



EOCKS ON THE NoRTH CoAST OF CORNWALL. 



By Howard Fox, F.G.S. 



(PLATE VII.) 



DURING the past 3'^ear I bad the pleasure of spending some weeks 

 on the north coast of Cornwall, south of the Camel, examining 

 the I'ocks exposed in the cliffs and on the foreshores of the various 

 coves, some of which I had not previously visited. A part of ray 

 notes were communicated to the Annual Meeting of the Eoyal 

 Geological Society of Cornwall last November, and with the 

 permission of the Society I propose to reproduce these and 

 additional observations obtained since, with the view more par- 

 ticularly of calling attention to some of the fossils which, though 

 fragmentar}', appear to me to yield not unimportant evidence on 

 the stratigraphical horizon of the rocks along certain parts of 

 the coast. 



It had been my intention to visit the various islands lying off 

 the north coast, but during my holiday month, September, there 

 was not a single day in which it would have been prudent to attempt 

 a landing either on the Qiiies Group or the Bull Rock off" Trevose 

 Head. I did, however, make a brief visit to Gulland Island, which 

 is, rightly, coloured greenstone on the Geological Survey Map. 

 The entire surface of this island is covered with angular weathered 

 fragments, which have been disjointed off from the massive rock, 

 a process still rapidly going on. The lower cliff on the south side 

 of the island is composed of a coarse-grained felspathic rock, whilst 

 higher up the rock is of the same kind but much finer grained. 

 The exposed rock surfaces, within reach of the waves and spray, 

 weather nearly black, whilst the rocks bej'ond are of a rusty-brown 

 appearance. 



Padstow ITarhour. — In the rocks both to the north and to the 

 south of the River Camel, simple cup-corals and fragmentary 

 crinoidal remains occur, but for the most part they are unfavourably 

 preserved. 



Trevone. — An account of the fossils present at several distinct 

 horizons in the shales at this place, and more especially on the 

 foreshore, has already appeared in the Trans. Roy. Geol. Soc. 



DECADE IV. — VOL. VII. — NO. IV. 10 



