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THE 



QUARTERLY JOURNAL 



GEOLOGICAL SOCIETY OF LONDON. 



EDITED BY 



THE ASSISTANT-SECRETARY OF THE GEOLOGICAL SOCIETY. 



Quod si cui mortalium cordi et curae sit non tantum inventis hserere, atqu« 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, tanquatn veri scientiarum filii, nobis (si videbitur) seadjungant. 

 —Novum Organum, Preefatio. 



VOLUME THE SIXTY-FIRST. 

 1905. 



LONDON: 

 LONGMANS, GREEN, AND CO. 



PAKIS: CHAKLES KLINCKSIECK, 11 EUE DE LILLE. 



SOLD ALSO AT THE APARTMENTS OF THE SOCIETY. 



MDCCCCV. 



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