A. J. Jukes-Browne tfc R. B. Newton — Devonian Fossils. 311 



extending from the granite junction about 100 feet. At about 

 80 feet from the granite pebbly beds are exposed. One of them 

 passes downwards vertically into clay, the pebbles becoming fewer 

 and fewer. From the pebbly beds, which are grey, to the granite 

 the whole section is of deep-red clay with very little stone. At the 

 junction shown in Plate XXIV, as clean a junction between two 

 rocks as one can hope to see, the streakiness observed in the Tekka 

 Company's section is not so extensively developed, but is visible both 

 in the vertical section and in the floor of the mine, where the 

 junction can also be followed. No tourmaline or fluorite and mica 

 veins were seen, but in a section in another mine hard by a vein of 

 blue tourmaline was traced for 40 feet from the granite into the clay. 

 On the south side of the granite the clay has been largely worked 

 away, but an interesting point is that here one of the kaolin veins 

 I have describe'l elsewhere as traversing the clays was seen traversing 

 the granite. These veins of almost pure kaolinite, without any 

 proved felspar, are of exceptional interest, but this is not the place 

 to discuss them. 



The Peesent State of the Clay at the Junction. 

 To anyone unacquainted with the effects of tropical weathering 

 a surprising feature of the clay in both these sections at the granite 

 junction would be that it is soft enough to be cut by hand. Shales, 

 and some rocks harder than shales, generally weather to the con- 

 sistency of cheese in the Malay States, but in every section I have 

 seen the bedding is preserved up to the subsoil. At a granite 

 junction, however, where the latter is clearly intrusive, one would 

 expect some degree of greater hardness. In the case of shales and 

 other rocks this is found, and the lack of it in these clays is, I think, 

 ascribable to two causes. In the first place the clays, although they 

 contain a certain amount of grit, are everywhere rich in kaolinite, 

 and therefore it may be assumed that when the granite was intruded 

 they were very plastic and yielded easily to the pressure of the earth- 

 movements. This would result in the generation of a relatively small 

 amount of heat compared with less plastic rocks, and consequently 

 less alteration. Secondly, supposing silicification had been set up, 

 resulting in an indurated clay, the evidence of the effect of ground- 

 water on the large outcrops of quartzite in the country shows that in 

 the present position of the clays the siliceous cement would certainly 

 have been removed by now. 



V. — The Fossils found on the Site of the Torquay Museum. 



By A. J. Jukes-Browne, F.R.S., F.G.S., and R. B. Newton, F.G.S. 



Part I. By A. J. Jukes-Erowne. 



rilHE fossils which form the subject of this notice were obtained 



1 from the slates exposed in the excavations for the foundations 



of the ' Pengelly ' Lecture Hall, which was added to the Museum 



of the Torquay Natural History Society in 1894. They were 



collected by Mr. W. J. Else, the late Curator of the ^Nfuseum, and 



were examined by the late llev. G. F. Whidborne, who published 



some account of them in the Geological Magazine for 1901, p. 533. 



