Quart. Journ. Geol. Soc. Vol. LIY, PI. XX. 



s 



1 Imillll.iuilij Li.i. ml — Inm 



,10 Cables or 

 I"'""""""' <""'" '"' I Sea Mile 





REDUCED FROM THE ADMIRALTY ChART. 



J seen 4 or 5 leagues away.] 



