388 



STRATA OF CUMBERLAND AND DUMFRIES. 



With respect to the Triassic beds^ so far as yet exa- 

 mined in the district comprised in this paper^ they appear 

 to differ from the typical beds seen in Cheshire and South 

 Lancashire as to their divisions where Mr. Hull divides 

 the Trias as follows ^ : — 



Formation. 



Subformation. 



Thickness, 



Keuper.. j 



BUNTER,. • 



Red marl 



feet. 



3000 

 450 

 700 

 800 

 800 



Lower Keuper sandstone 



Upper mottled sandstone 



Pebble-beds 



Lower mottled sandstone 





5750 



In the soft, red_, variegated and false-bedded sandstones 

 of Longtown, Rockcliffe,, Holmhead, and Dalston, we have 

 a rock which would correspond with either the lower or 

 the upper mottled sandstone of that author ; but as yet 

 I have seen nothing of the pebble-beds. The whole of the 

 Triassic beds appear to have been deposited under cir- 

 cumstances of great quietude,, very different to those 

 in which the Permian beds were formed. The two divi- 

 sions of the Keuper are well developed in the waterstones 

 and red and variegated marls containing beds of gypsum, 

 but, so far as yet known, without affording beds of salt, 

 although it is probable they may be there. The red marls 

 no doubt pass upwards into the Lias at Quarry Gill and 

 Oughterby, but I have seen no natural section showing 

 the passage of the one into the other. 



* " On the New Subdivisions of the Triassic Rocks of the Central Counties," 

 by E. Hull, A.B., F.G-.S., Transactions of the Manchester Geological So- 

 ciety, vol. ii. p. 31. 



