6'i 



THE 



QUARTERLY JOURNAL 



GEOLOGICAL SOCIETY OF LONDON. 



EDITED BY 



THE ASSISTANT-SECRETARY OF THE GEOLOGICAL SOCIETY. 



Quod si cui mortalium cordi et curas sit non tantum inventis hserere, atque iis uti, sed ad ulteriora 

 penetrare ; atque non dispntando adversarium, tied opere naturam vincere ; denique non belle et probabiliter 

 •opinari, sed certo et ostensive scire ; tales, tanquam veri scientiarum fllii, nobis (si videbitur) se adjun ant, 

 —Novum Organum, Prafatio. 



VOLUME THE SIXTY-NINTH. 

 1913. 



LONDON : 

 LONGMANS, GREEN, AND CO. 



PARIS: CHARLES KLINCKSIECK, 11 RUE DE LILLE. 

 SOLD ALSO AT THE APARTMENTS OF THE SOCIETY. 



22834-^ 



