138 
PRE-CAMBRIAN VOLCANOES 
BOOK II 
of Bradgate (No. 6 of the Charnwood groups) may be the e(pii valent of the- 
quartzite which in Shropshire and Warwickshire forms the base of the 
sedimentary Cambrian formations. If that correlation could be established, 
the volcanic series below the quartzite in Charnwood might be regarded as 
representing the Uriconian volcanic series of Shropshire. 
