Vol. Lxxvii. No. 308. 



Part 4. 



THE 



QUARTERLY JOURNAL 



OF THE 



GEOLOGICAL SOCIETY. 



EDITED BY 



THE PERMANENT SECRETARY. 



\ [With Two Plates, illustrating Papers by Dr. A. B. Walkom < 

 and Miss A. I. McDonald & Dr. A. E. Trueman.] \ 



December 31st, 1921. 



PARIB:— CHARl^ HfolNCEBIECK^ 11 Eg^^^ LILLE. 

 SOLD ALSO AT Tfffe^^^uE^S^fc&S^^HE SOCIETY. 



Price Seven Shillings and Sixpence, 



