54 
THE GEOLOGIST. 
little liaviug 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 fovrud in the millstone grit, are termed Eosser 
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 by 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, aiid ii 
is my regret that I have not, as yet, informed myself more as to his 
labours. His recent posthumous work, the " Testimony of the E.ocks," 
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, for I 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 
