HOLL MAI VEEN HILLS. 



101- 



it is to this epoch of elevatory movement (i. e. after the close of the 

 Lower Old Red period) that we must refer much of that tilting of 

 the Upper Silurian rocks which has brought them into their present^ 

 position, although something of this is probably also due to the sub- 

 sequent changes of level. The faulting on the western side of the 

 range must have belonged to a subsequent epoch, as some of the 

 displacements are lateral, caused by the unequal pressure of the up- 

 heaved metamorphic rocks on already tUted beds. 



To this epoch of elevation and denudation there succeeded one of 

 gradual subsidence during the age of the Coal-measures. Between 

 the Coal-measures and the Permian (Roth-todt-liegende ?) there is 

 again unconformability; and again between the latter and the Trias, 

 as at Great Whitney, the Permian breccia is succeeded by the Keuper 

 marls. 



That the downthrow on the eastern side of the range, extending 

 from Abberly, on the north, to Newent, and thence to near Purton 

 Passage on the Severn, was posterior in date to the Lias, is shown 

 by the relative position of the latter, in the Borrow and Corse Wood 

 Hills, to the underlying Keuper marls and sandstones, and by its juxta- 

 position, north of Pui'ton Passage, with the Old Red Sandstone. 



Figs. 7-10. — Fossils from tlie Upper Cambrian Rocks of the 

 Malvern Hills. 



Fig. 7. 



Fiff. 8. 



7. Serpulites fistula, Holl : a, natural size ; b, enlarged. 



8. Lmgula pygmcea, Salter : a, natural size ; b, magnified. 



9. Oholella Scdteri, Holl : a, natural size ; b, magnified. 

 10. Obolella PhiUipsi, Holl ; magnified 8 diameters : a, 



b, dorsal valve ; c, profile. 



ventral valve; 



