i-jo PROCEEDINGS COTTESWOLD CLUB 1913 



the Lake District generally, andesites, felsites and volcanic 

 ashes from the Arenig mountains of North Wales ; stratified 

 Ordovician and Silurian rocks with fossils from the Berwyn 

 Hills, rhyolites, quartzites, diorites and sandstones from the 

 Wrekin ; dolerites and basalts from the Rowley District in 

 the Black Country, and innumerable boulders and pebbles 

 from the Carboniferous Permian and Triassic formations of 

 the north-western Midlands, and the north-western part of the 

 Birmingham country itself. 



Most of the fine boulders collected at Boumville by 

 Mr Barrow are masses of a dark igneous Plutonic rock, usually 

 known as felsite or andesite, identical with the rock which 

 forms a large part of the Arenig mountain range, several miles 

 west of Bala Lake in the basin of the river Dee, North Wales, 

 and fully eighty miles in a straight Une from Bournville itself. 



