Quart. Journ. Geol.Soc VoLWCVEFLXL. 



■ 1 Fcuztts . 



Ike mark ' — ? is ore the cLo^tVJrr-ow Side. 



O.K.S = Outher of KtrhUrctOTh Sarulst. 



ISLE BASIN. 



Tredt-Dcutger field tith, Londor 



