238 THE ASHBOUKITE AND BUXTON EAILWAY. [May 1 899, 



many parts of England, in the Carboniferous Limestone, that they 

 evidently could not ail have proceeded from one source. There 

 seem to have been a number of small vents scatteied over an area 

 that was undergoing prolonged subsidence. In the second place, 

 the Author had shown that this outburst occurred in the so-called 

 Yoredale Series, and therefore at a later date than any known in 

 the Isle of Man, in other parts of Derbyshire, or in Somerset : in all 

 these districts the contemporaneous igneous rocks lay some distance 

 down in the limestone. 



Prof. Watts pointed out that the volcanic rocks of Limerick 

 appear to occur on about the same horizon as those of Derbyshire. 

 The Limerick basin is surrounded by a series of small volcanic 

 necks, and thus the point mentioned by the previous speaker is 

 also paralleled in Ireland. 



The President, Mr. Bareow, Mr. Teall, and Dr. Hinde also 

 spoke. 



The Atjthoe thanked the Pellows for the kind way in which they 

 had received his paper. In reply to Mr. Barrow, he said that what he 

 (the Author) had described as a thickly-bedded ash was undoubtedly, 

 from its occurrence in the field and behaviour under the microscope, 

 a fragmental rock and not a lava. In reply to Prof. Hull, he said 

 that the old idea of the restriction of the term toadstone to two 

 beds of lava no longer applies ; that the term includes rocks from 

 volcanic necks of the puy type, from lava-flows, from volcanic ashes, 

 and from intrusive sills. 



In answer to Mr. Lamplugh, he said that similar Drift was found 

 in other parts of the county. The foreign igneous rocks were 

 probably derived from the Lake District. He had not gone more 

 fully into the subject of the Drift in the cuttings, as Mr. Deeley 

 was working out various problems connected with the direction of 

 travel of the Drift. 



