^^^' 55'] STEUCTTJRE OF THE SOrTHERN MALVEENS. 



149 



eastern end of this mass the hill sends a spur towards the north- 

 west. This is represented in the Survey maps as a continuation 

 of the gneissic series, but in Holl's map ^ it is correctly marked as 

 part of the Malvern Shale Series. 



A smaller, more northerly spur runs north-westward from the 

 extreme northern end of the hill. This is formed by a slip of 

 HoUybush Sandstone, together with Black Shale and basalt. The 

 structure of these spurs may be conveniently considered together 

 with that of the district of White-leaved Oak (p. 159). 



The schistose and gneissic rocks of the hill appear to be bounded 

 everywhere by faults : on the south-east and east, by the great 

 fault which brings down the Trias ; on the north-west, by a fault 

 which intersects the surface in a curved line, against which strike 

 the successive zones of the Malvern Shales. 



Pig. 16. — Section across Chase End Hill, on the scale of 

 6 inches to the mile. 



E.byS. 



[The above figure represents the probable relations of the rocks of the hill ; 

 the section is not drawn parallel to the dip of the shales, nor to that of 

 the fault, and thus both dips appear to be lower than they really are.] 



F'F 



Fault between Trias and 

 Archaean, 

 i'^i^^: Fault. 

 <^=: Trias. 

 <■= Upper Grey Shales. 



6=Grrey Shales, with interbedded 

 diabase (Coal Hill igneous 

 band). 



a.=Arch£ean. 



The Triassic rocks are exposed along the drive to Bromsberrow 

 Place, in the form of a red sandstone with occasional pebbles of 

 piuk quartz. The dip is south-westerly at about 20°. 



The fault running along the north-western slope of the hill 

 curves round on the north-east towards the east, and on the south- 

 west towards the south-east, as it descends to lower ground in 

 each case. The actual junction is nowhere exposed, but a plane 

 fault dipping south-eastward at an angle of 30° would give an 

 outcrop closely agreeing with that observed (6g. 16). 



The Upper Grey Shales, wherever seen close to the ridge, have a 

 reversed dip towards the east-north-east, while the lower strata 

 of the same series, with interbanded basalts, seen in the spur 

 farther north-eastward, dip east by north. 



Quart. Journ. Geol. Soc. vol. xxi (1865) facing p. 72. 



