

, 



QUARTERLY JOURNAL 



GEOLOGICAL SOCIETY OF LONDON. 



EDITED BY 



THE PERMANENT SECRETARY OF THE GEOLOGICAL SOCIETY. 



Quod si cui mortaliurn cordi et curae ait non tantum inventis hserere, atque iis uti, sed ad ulterior* 

 penetrare ; atque lion disputando ad versarium, sed opere naturam vincere; deniquenon belle et probabiliter 

 opinari, sed certo et ostensive scire ; tales, tanquam veri scientiarum filii, nobis (si videbitur) se adjungant 

 — Novum. Organum, Trcefatio. 



VOLUME THE SEVENTY-NINTH, 

 fob 1923. 



V. 4 . , . 



LONDON : 

 LONGMANS, GREEN, AND CO. 



PARIS: CHARLES KLHSTCKSIECK, 11 RUE DE LILLE. 



SOLD ALSO AT THE APARTMENTS OF THE SOCIETY, 



1IC.MXXIII. 



