54 



THE GEOLOGIST. 



little having been thrown down in plane horizontal surfaces from 

 mechanical suspension in the water. It is a kind of deposit, which, if 

 the sand be readily supplied, may be effected in very shallow water, 

 and hence, by continued subsidence, a very great thickness may be 

 eventually obtained. The Pennant rocks are not abundant in coal 

 seams in this portion of the basin, but at the Town Hill, at Swansea, 

 according to Mr. Logan, there are at least twelve veins in these 

 sandstones, which there attain the thickness of 2,125 feet. Indeed, 

 the only seam at Ebbw Vale is the Troed-y-rhiw coal, two feet four 

 inches thick. Locally, the small veins found in the rocks above the 

 coal, as also those foumd in the millstone grit, are termed Rosser 

 Veins. 



I propose, in another paper, to describe the veritable coal seams, with 

 their fossil contents. 



On Fish Remains in the Yorkshire Coal Field, near Wakefield, 

 Communicated ly G. W. 



The disposition of the coal measures is pretty generally known by most 

 persons who have paid any attention to the science of Geology. 



It will not, therefore, be necessary for me to describe their position 

 or the place they occupy ; undoubtedly they are of very ancient origin, 

 being nearly allied to the old red sandstone, amongst which some of 

 the fossils, or rather similar fossils, have been found, which I am about 

 to describe. 



Hugh Miller is the great authority regarding the old red sandstone 

 deposits ; no man laboured here with more assiduity than he, and £« 

 is my regret that I have not, as yet, informed myself more as to his 

 labours. His recent posthumous work, the Testimony of the Rocks," 

 alludes to some fish remains which Scotland has produced ; but 

 Professor Agassiz is still more eminent as it regards this interesting 

 class of fossils. 



I said interesting, fori had no conception that fish remains could have 

 been rendered so remarkable, and this may be owing to the delicate and 

 soft nature of the mud in which they have been laid. I cannot imagine 



