Qcso/. 



THE 



QUARTERLY JOURNAL 



GEOLOGICAL SOCIETY OF LONDON, 



EDITED BY 



THE ASSISTANT-SECEETAEY OF THE GEOLOGICAL SOCIETY. 



Quod si cui mortalium cordi et curae sit non tantum 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) seadjungant. 

 '-^Novum Organum, PrcBfatio, 



VOLUME THE THIRTY-SIXTH 



1880. 



LONDON: ^^si^lmtl ^^^ ' 



LONGMANS, GEEEN, EEADEE, AND^BTEIT 



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

 LEIPZIG : T. O. WEIGEL. 



BOLD ALSO AT THE APARTMENTS OF THE SOCIETY, 



MDCCCLXXX. 



