/\/ » ri ' THE 



QUARTERLY JOURNAL 



GEOLOGICAL SOCIETY OF LONDON. 



EDITED BY 



THE ASSISTANT-SECRETAEY OE THE GEOLOGICAL SOCIETY. 



Quod si cui mortalium cordi et curae sit non tanturu inventis haerere, atque lis uti, sed ad ulteriora 

 penetrate ; 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 Organum, Prce/atio. 



VOLUME THE TWENTY-THIRD. 



1867. 



PART THE FIRST. 

 PROCEEDINGS OF THE GEOLOGICAL laOOIETti''^^^^^ 



2S^ ^"^^ 



LONDON: \ ^ ^ ^,.<!^^^^ 



LONGMAN, GEEEN, EEADER, AND DYEK!" "^ 



PARIS:— FRIED. KLINCKSIECK, 11 RUE DE LILLE; J. ROTHSCHILD, 14 RUE DE BUCL 

 LEIPZIG, T. O. AVEIGEL. 



SOLD ALSO AT THE APABTIVLENTS OF THE SOCIETY. 



MDCCCLXVII. 



