404 5ir. o. t. jokes ois T the hartfell-valentian [Xov. 1909, 



The nodule-layer is succeeded by blue-black flags and shales 

 which are highly cleaved, and the fragments of graptolites 

 ■extracted from them are difficult to identify ; but 25 yards up 



Fig-. 9. -Plan of 

 section along Nant Fuches-wen - 

 on the scale of 18 inches to the mile. 



stream from the nodules (representing a thickness of about 50 feet) 

 the leptotheca band is exposed (F. 24), and, as usual, proved rich 

 in well-preserved graptolites. These are found in full relief in 



