Dr. C. Callaioay — Metajnorphic Area in Shropshire. 363 



axis of tlie old rocks, ranging parallel to the Wrekin chain, consists 

 of volcanic ejecta and highly indurated grits, which are probably to 

 be referred to the younger of the two Archgean groups hitherto 

 recognized in the county. The relations between the volcanic and 

 the gneissic systems is clearly defined by the Charlton Hill (see 

 map) conglomerate (a band in the volcanic series), which contains 

 numerous well-rounded pebbles of rock precisely similar to the 

 granitoid gneiss of Primrose Hill. This fact implies a considerable 

 break between the two groups. 



nusU^crn. \^W ^olcaniic 



IfZtTmssg/' mi M&am(ynfiik 



Scale : One incli to the Mile. 



Map showing the relation of the Eushton Schist to the neighbouring 

 Archaean masses, Shropshire. 



Some time since, I discovered another patch of Archeean rock of 

 a type hitherto unknown in England. This mass lies between the 

 Wrekin and Charlton Hill (see map, supra). On the Survey Map, 

 the entire breadth of this interval is occupied with the quartzite, 

 described as " altered Caradoc." This rock I have shown ^ to be 

 older than the Hollybush Sandstone, and that it everywhere laps 

 round the ArcliEean masses. It probably extends continuously from 

 the Wrekin to the village of Eushton, but from this point to Charlton 

 Hill we are on the rock now to be described. 



At the west end of Eushton, just where three roads meet, there is 



a slight outcrop of metamorphic rock, with a clear foliation strike to 



the north-west. About two furlongs to the north-north-west, there 



is similar schist, but the strike is more northerly. To the west of 



1 Ibid, August, 1878. 



