REMNANTS OF EXTINCT VOLCANOES. 459 



marine life ; the St. Erth. Pliocene beds at least 50 fathoms 

 beneath their present level ; and the London basin a receptacle 

 of the disintegrated schorlaceous granitic sands of Devon and 

 Cornwall. 



Subterranean energy has changed the face of nature, and 

 lifted Snowdon far above the ocean wave, carrying with it the 

 remains of marine organisms to a great height above the sea. 

 Hayle and St. Erth have become centres of commercial and 

 engineering activity, where genius has raised its head ; and on 

 the disintegrated and drifted sands from Devon and Cornwall 

 stands to-day a part of the most famous city of the world. 



