\ \\i » n • 



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 iaventis 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 fllii, nobis (si videbitur) se adjungant. 

 — Novum Organum, Prcefatio. 



VOLUME THE TWENTY-NINTH. 



1873. 



PART THE FIRST. 

 PROCEEDINGS OF THE GEOLOGICA 



LONDON : 

 LONGMANS, GREEN, READER, AND DYER. 



PARIS: FRIED. KLINCtfSIECK, 11 RUE DE LILLE; F. SAVY, 24 RUE HAUTEFEUILLE. 

 LEIPZIG : T. O. WEIGEL. 



SOLD ALSO AT THE APARTMENTS OP THE SOCIETY. 



MDCCCLXXIII. 



