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specimens had been found. We soon moved on again, and rejoined the Alpine 

 party on the west side, in the wild ravine, which seems formed by a fracture and 

 slip of a great mass of the Old Red beds which have parted, leaving a huge cliff 

 on either side. Here we were entertained by listening to a very instructive address 

 by Dr. Bevan, on the various strata in which Iron Ore is found, which I trust will 

 be printed for our benefit, if, as I hope and believe, our friend had written it out, 

 but had forgotten to bring it with him. 



Having rested here on the rocks for some time we walked on, with the 

 occasional mishap of losing one another in the tall gorse, till we got to another 

 quarry, not far from Pandy Station, where we found in the Cornstone some fine 

 shields of Pteraspis, shewing how well worth more close examination than it has 

 hitherto received this neighbourhood is. After a very pleasant day we returned 

 to Abergavenny, much indebted to our kind friends, Drs. McCuUough and Steele, 

 for exhibiting to us the treasures of their quarries ; and I trust their further 

 investigations will be crowned with success. If each of our members would as 

 actively and continually examine the rocks in his own neighbourhood, whether 

 Silurian, Devonian, or Carboniferous, I feel sure the result would amply reward 

 him — if not in new species, at least in health and geological knowledge, and 

 probably in all three. 



And now having (I fear in a tedious manner) gone over the routine of our 

 Excursions, I should wish, if you are not already tired, to say a few words in re- 

 ference to the classification of the Upper Ludlow, Aymestry, and Lower Ludlow 

 rocks. Our great authority. Sir Roderick I. Murchison, as well as the Maps of the 

 Geological Survey, have laid down the whole of Whitcliff at Ludlow as Upper 

 Ludlow. Our friend Mr. Cocking, soon after I came to live at Ludlow, hinted to 

 me his belief that, notwithstanding these assertions, the Aymestry Limestone 

 was shown there ; and though I was then a novice, and quite incompetent to ofier 

 an opinion on the subject, I bore his observation in mind. Some time after, I had 

 the great advantage of seeing Mr. Salter at Ludlow, and called his attention to 

 the subject. On breaking off a few fragments of rock at the foot of the hill, he 

 unhesitatingly pronounced that, from a fault existing in a line with the New 

 Bridge, as far as the green slope on the north side of the quarry opposite the next 

 weir, the beds at the bottom of the hill were Aymestry Limestone, as evinced by 

 the abundant presence of Strophemena filosa. Since that time, I have con- 

 tinually examined both these beds and corresponding beds in other localities, and 

 feel convinced that the line of demarcation between the Aymestry Limestone 

 and the upper Ludlow has been drawn in the wrong place — the Aymestry includ- 

 ing within its limits the bands of Rhynchonella navicula which Sir R. Murchison 

 considers as the base of the Upper Ludlow. Let it not be considered a matter 

 of no moment whether this band be called the bottom of one, or the top of the 

 other, of two contiguous beds, remembering that the only way in which different 

 beds can be distinguished is by the fossils contained in them respectively. Now 

 the band of rock in question, reaching from the recognized Aymestry Limestone 

 for about thirty or forty feet, perhaps, in thickness, though included in the 

 Aymestry, cannot be called Limestone, although it is much more calcareous than 



