/£■ 







n\' THE 



QUARTERLY JOURNAL 



GEOLOGICAL SOCIETY OF LONDON. 



EDITED BY 



THE ASSISTANT-SECRETARY OF THE GEOLOGICAL SOCIETY. 



Quod si cui raortalium cordi et curae 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 videbitur) seadjungant, 

 — Novum Organum, Prcefatio. 



VOLUME THE FIFTY-SIXTH. 



1900. 



LONDON : 

 LONGMANS, GREEN, AND CO. 2 2 T ^ ^ 8 



PAEIB : CHAELES KLINCKSIECK, 11 EUE DE LILLE. 

 LEIPZIG: T. O.WEIGEL. 



SOLD ALSO AT THE APARTMENTS OF THE SOCIETY. 



MDCCCC. 



