140 PROF. T. T. GROOM ON THE GEOLOGICAL [Feb. I9OO, 



to Symonds, 1 the Cambrian conglomerate was formerly to be seen 

 on the western side of the great quarry, at the southern end of 

 Swinyard Hill. Unfortunately, the relations of this formation to 

 the Archaean rocks of the quarry were not described. The Wool- 

 hope Limestone, though badly exposed, may be traced by debris 

 and by the steep slope that it forms, also by occasional exposures 

 along a double line of outcrop on the western slope of Swinyard 

 Hill. The dip of both bands 2 is easterly, and the area to the west 

 and east of the western and eastern bands respectively is occupied 

 by May Hill Sandstone; the limestone, therefore, appears to form 

 an overturned syncline. 



The supposed relations of the rocks at the northern end of 

 Swinyard Hill are shown in fig. 1, p. 141. 



III. The Herefordshire Beacon. 



The Herefordshire Beacon is certainly one of the most imposing 

 and geologically interesting hills in the whole Malvern Range. It 

 is bounded on the south by the ' Silurian Pass,' and on the north by 

 a deep depression running from Wind's Point to Little Malvern. 



The western and higher part of the hill is composed of rocks 

 of the Malvernian Series ; the eastern part is formed by the 

 'Warren House Hocks' of Hangman's Hill, Broad Down, and 

 Tinker's Hill. These rocks, first regarded byHoll 3 as metamor- 

 phosed Cambrian, were compared by l)r. Callaway 4 with the 

 jhyolitic Uriconian Series of Shropshire ; they have been studied 

 by Green,"' and by Mr. Rutley 6 and Mr. Acland. 7 They are shown 

 to consist of rhyolites, andesites, basalts, and tuffs; the bedding 

 sometimes well marked, has a prevailing easterly dip. 



The line of junction between the Uriconian and Malvernian 

 Series runs along a marked depression, extending in a north-north- 

 easterly direction from Clutter's Cave, and turning sharply east- 

 north-eastward north of Tinker's Hill. South of Clutter's Cave the 

 junction is marked by no surface-feature ; evidently it terminates 

 against the patch of May Hill Sandstone that occupies the' Silurian 

 Pass.' South of Hangman's Hill the Uriconian Series comes directly 

 into contact with the sandstone. The junction with the Malvernian 

 Series is nowhere actually exposed, but the circumstance that it 

 curves round eastward as it descends to lower levels suggests that 

 the plane of junction dips in that direction. In the absence of 

 detailed knowledge of the disposition of the lava-beds and tuffs, it 

 is at present impossible to determine wh ether this junction is a 

 fault or a surface upon w r hich the Uriconian series was originally 

 deposited. 



1 ' Old Stones' 2nd ed. (1884) p. 24. 



2 The eastern band is not exposed at any point immediately west of 

 Swinyard Hill, but it is seen dipping eastward near Walm's Well, immediately 

 to the north. 



3 Quart. Journ. Geol. Soc. vol. xxi (1865) pp. 93, 94. 



4 Ibid. vol. xxxvi (1880) pp. 536 et seqq. 5 Ibid. vol. li (1895) pp. 1 et seqq. 

 ,; Ibid. vol. xliii (1887) pp. 481 et seqq. » Ibid. vol. iiv (1898) pp. 556 et seqq. 



