356 THE EXISTENCE OF A FAULT IN THE LIAS NEAR RUGBY. 



it is found in places scattered over more than a square mile. It 

 has a Stonesfield-slate character. 



This line of fault continued further would connect with the Ather- 

 stone and Nuneaton fault, and agrees with it in having its down- 

 throw on the N.E. side. 



As regards the amount of the throw it is not easy to speak con- 

 fidently. At Hillmorton, however, it cannot be less than 120 feet ; 

 and at Brownsover it may be as much as 500 feet, if I am right in 

 my \iew of the origin of the Oolitic cap to the Brownsover plateau. 



There will be some points of special interest in determining the 

 date of this fault, and its effects on the valley-system in its neigh- 

 bourhood. It appears to me to have caused the existence of that 

 extinct lake that I spoke of before, and to have altered the water- 

 shed. But it has left very few traces on the surface, which is here, 

 for the most part, deeply overlaid with drift. 



I may perhaps be permitted to mention that the Natural-History 

 Society of the School has just constructed a model, on the scale of 

 6 inches to the mile, of our neighbourhood, and that any one who 

 should feel inclined to come down and examine into the question, and 

 thinks that an inspection of the model would assist him, will be 

 made most welcome to all the assistance in our power. 



Discussion. 



Prof. Ramsay said that he was puzzled with the description of the 

 sands and clays brought together vertically by a fault, and that he 

 had never seen a fault of Postglacial age. He did not think the 

 phenomena described were due to a fault. With regard to the sup- 

 posed Oolitic outlier, which was said to be of Stonesfield Slate resting 

 upon Lower Lias, he did not see how such an arrangement could be 

 brought about by a fault ; for underneath the Stonesfield Slate in that 

 district we naturally expect to find the Inferior Oolite series and the 

 Upper Lias and Marlstone. The Oolitic mass had probably been 

 conveyed to its present position by glacial action, as in many cases 

 in the same parts of the country large masses of rocks occur in 

 remarkable positions, as, for example, an erratic mass of Marlstone 

 overlying Oxford Clay. 



Mr. Tate stated, in confirmation of the remarks of Prof. Ramsay, 

 with which he fully agreed, that in Yorkshire he had seen a great 

 mass of Cleveland ironstone resting upon Upper Lias. 



