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the Mountain Limestone, and that of an ancient, 
rather than of a recent date. 
Since the above observation was written, I have 
had the pleasure of conversing with a Gentleman, 
whose judgment, on Geological subjects, I regard as 
important, and having great weight. He is of opi- 
nion, that our rocks are of a more ancient date 
still, and that they ought to be arranged with the 
transition, Limestone. And I find this opinion con- 
- firmed by the Rev. William Buckland, Professor of 
Mineralogy and Geology, in the University of Ox- 
ford, in his recent publication, which gives an. in- 
teresting account of an assemblage of fossil teeth 
and bones, discovered in a cave at Kirkdale, York- 
shire, in the year 1821; and in which, he applies 
the term transztion, in speaking of the quarries at 
Oreston; which quarries are situated near Plymouth, 
and are, in fact, part of the same stratum of Lime- 
stone; the river Plym only, dividing the one from 
the other. - . 
Again, Organic Remazns are more distinctly visible, 
and abound most, at those points where the Lime- 
