510 MR 6 P. EUTLET ON THE ROCKS 



version is still hypothetical, and is not the outcome of any detailed 

 fieldwork. 



Fig. 4. — Hypothetical Section through the North Hill and the 

 Worcestershire Beacon. 



r f 



Worcestershire Beacon. North Hill. 



g = Granite. c2=Diorite. mcZ = Mica-diorite. £ = Granulite. h = Hornblende- 

 gabbro. s = Gneissic rocks. FF = Faults. 



The dotted lines indicate the relative positions of the rocks prior to faulting. 

 The rock marked Granite, g, is really a very hornblendic Granite or Quartz- 

 syenite. 



It may also be desirable to alter that part of the section which 

 lies between the Herefordshire Beacon and the Raggedstone, treating 

 the northern part of Swinyard's Hill as part of a possibly once deep- 

 seated mass of granite or pegmatite faulted in among newer rocks. 



The late Dr. Holl was of opinion that this part of Swinyard's Hill 

 was chiefly composed of granitic veins *, and it is quite possible that 

 he may have been right, since he mentioned gneissoicl rocks, horn- 

 blendic gneiss and schists as occurring with the granite. 



His observations in this locality were much more detailed than my 

 own, yet I must admit that this portion of the ridge did not appear 

 to me to consist of veins, and he himself seems to have felt consider- 

 able doubt upon this point, as evidenced by the expressions " Granite, 

 probably a vein," " Granite vein ? " 



The rocks north of this fault crossing Swinyard's Hill and forming 

 the highest part of the ridge appear to be coarse hornblendic granite 

 or quartz-syenite, diorite, and gneiss. The diorites occur on either 

 side of the coarse-grained quartz-syenite, as roughly indicated on 

 the section (fig. 3, facing p. 488), and the contact of similar rocks 

 in the Worcestershire Beacon and North Hill is worthy of note. 



The southern part of Midsummer Hill also shows an intrusive or 

 else an interbedded diabase, probably the former. 



* Op. cit. p. 77. 



