(j^fSOf* THE 



QUARTERLY JOURNAL 



GEOLOGICAL SOCIETY OF LONDON. 



EDITED BY 



THE ASSISTANT-SECEETARY OF THE GEOLOGICAL SOCIETY. 



Quod si cui mortalium cordi et curse sit non tantuin inventis haerere, 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) se adjungant 

 — Novum Orgamim, Prcefatio. 



VOLUME THE TWENTY-FIFTH. 



1869. 



PART THE FIRST. 

 PROCEEDINGS OF THE GEOLOGI 



LONDON : 

 LONGMANS, GREEN, READER, AND DYER. 



PARIS: FRIED. KLINCKSIECK, 11 RUE DE LILLE; F. SAW, 24 RUE HAUTEFEUILLE. 



LEIPZIG: T.O.WEIGEL. 



SOLD ALSO AT THE APARTMENTS OF THE SOCIETY, 



MDCCCLXIX, 



