257 



below the so-called Permian, and whieli cannot be mistaken for 

 anything else ; and it is, or was, from one particular bed only 

 in the Limestone (* in section) that the Terebratulse were 

 obtained. 



The accompanying section will show the position of the 

 Yellow Marly Sandstone, with relation to the Carboniferous 

 Limestones below, and thus, I hope, clear up the doubts, both 

 as to position and age. 



Section 1.- -Showing the position of the Yellow Marly Sandstone with relation to the 

 Carboniferoua Limestone. 



Yellow Series 

 (ift. Cin. 



N. Red Marls 

 20ft. 



The above section, like 

 many others covered by the 

 Bunter and Keuper Marls, 

 exhibits their Eed and 

 Yellow beds horizontally 

 covering the older rocks 

 below, here denuded into 

 basin-Uke hollows, the 

 portion in places resting 

 upon Limestone, in others 

 the Red, as at A and B ; 

 and thus, when seen at 

 different localities with 

 either one or the other 

 exposed, tend to mislead, 

 or cause different readings 

 of the same series. Such 

 is the case at the New Passage, where, immediately on the 

 river, no Carboniferous Limestone is exposed, and the Red and 

 Yellow Marls are nearly 30 feet thick. (See Sect. 2.) In the 

 hoUowinthe above section, (1) (at **,) nearly the same thickness 

 occurs, but the Limestones below are plainly determinable. It 

 is the Yellow Marly Sandstone that seems to have misled most 



c^ 



Section 2.— Section exposed on the banks of the 

 Severn, at New Passage. The Carboniferous beds 

 assumed below. 



