260 



STRATIGRAPHICAL GEOLOGY 



doubt. This year (1911), however, Mr. Cosmo Johns " has published 

 evidence which seems to show that the Pendle limestone is the 

 equivalent of the " main limestone " near the top of the Yoredale 

 Beds. 



The Yoredale Beds consist of limestones with intercalated bands 

 of shale and sandstone, the limestones being persistent bands which 

 have been traced for long distances, and each band has received a 

 special name. The highest of the Yoredale limestones is known 



SCOTLAND 



NORTHUMBERLAND 

 Newcastle 



Stanford's G&y 1 Esta]} c , London* 



Fig. 89. MAP OF THE XOBTH-WESTEBN COUNTIES TO SHOW THE POSITIOX 

 OF THE PRE-CAEBONIFEROUS KIDC1E (GOOdcllild). 



as the " main limestone," and the lowest as the " Hardraw lime- 

 stone." Between these at Ingleborough there are three other 

 limestones, and farther north two others come in, so that in 

 Wensleydale there are seven Yoredale limestones. 



Dr. Vaughan informs me that the fauna of the Yoredale Beds is 

 identical with that of the upper part of the Dibunophyllum zone 

 of Bristol (D ), and thus, if the beds are the equivalents of the 

 Lower Pendleside Group, the latter must have been formed under 

 different bathymetric conditions. 



A.bove the "main limestone" of Wensleydale there are some 

 peculiar beds which, though of no great thickness (160 feet), are 



