THE 



N' H 



QUARTERLY JOURNAL 



GEOLOGICAL SOCIETY OF LONDON. 



EDITED BY 



THE ASSISTANT-SECRETAKY OF THE GEOLOGICAL SOCIETY. 



Quod si cul mortalium cordi et curse sit non tantura 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) se adjungant. 

 — Novum Organum, Prafatio. 



VOLUME THE TWENTY-EIGP^'^ ^^ ' 



1872. _ . _ 



2%a^4 



^■iumnif''"^^ 



PART THE FIRST. 

 PROCEEDINGS OF THE GEOLOGICAL SOCIETY. 



LONDON : _ 



LONGMANS, GEEEN, READEE, AND DYEE. 



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

 LEIPZIG : T. O. WEIGEL. 



SOLD ALSO AT THE APARTMENTS OF THE SOCIETY. 



MDCCCLXXH. 



