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THE 



1/ 



QUARTERLY JOURNAL 



OF THE 



GEOLOGICAL SOCIETY OF LONDON. 



EDITED BY 



THE PERMANENT 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 fllii, nobis (si videbitur) se adjungant. 

 — Novum Organum, Prcefatio. 



VOLUME THE SEVENTY-SECOND, 



FOR 1916. 



LONDON : 



LONGMANS, GREEN, AND CO. 

 paris : charles klu5tcksieck, 11 rue de lille, 

 sold also at the apartments of the society, 

 hcmxvii. 



