*/«^ SSO, bird. 



THE 



QUARTERLY JOURNAL 



GEOLOGICAL SOCIETY OF LONDON. 



EDITED BY 



THE ASSISTANT-SECRETARY OF THE GEOLOGICAL SOCIETY. 



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

 penetrare ; atque non disputando adversarium, sed opere naturam vincere ; denique non belle et probabiliter 

 opinari, sed certo et ostensive scire ; tales, tanquam veri scientiarum filii, nobis (si Tidebitur) se adjungant. 

 — Novum Organum, Prcefatio. 



VOLUME THE SIXTY-SEVENTH 

 1911. 



LONDON : 

 LONGMANS, GREEN, AND CO. 



PARIS : CHARLES KLINCKSIECK, 11 RUE DE LILLE. 



SOLD ALSO AT THE APARTMENTS OF THE SOCIETY. 



MDCCCCXI. 



Z20S\d^ 



