286 SCIENCE PROGRESS. 



Green, A. H. Mem. Geol. Survey, N. Derby sJiire. Second 



edition. 

 Strahan, A. Geol. Survey Mem., Isle of Wight, chap, xv., 



1889. 

 Strahan, A. Geol. Survey Mem., Isle of ' Purbeck, chap. xvL. 



(in the Press). 

 STRAHAN, A. Geol. Survey Mem., Flint, Mold and Ruthin,. 



p. 151. 

 Strahan, A. Geol. Survey Mem., Kendal, Sedbergh, etc.,. 



pp. 1 and 2. 

 Strahan, A. Proc. Geol. Assoc., vol. xiv., p. 405. 

 Jukes-Browne, A. J. Mem. Geol. Survey, Cambridgeshire - y 



chap. xi. 

 Jukes-Browne, A. J. Mem. Geol. Survey, Lincolnshire. 

 Jukes, J. B. Quart, fourn. Geol. Soc, xviii., p. 37S. 

 TOPLEY, W. Geology of the Weald, etc., etc. Mem. Geol'.. 



Survey. 



(7) Marr, J. E. Science Progress, p. 218, 1897. 



(8) DELABECQUE, A. Les Lacs Francais. Paris, 1898. 



(9) Gilbert, G. K. Fifth Annual Report of the U. S. Geol.. 



Survey. 



(10) Gulliver, T. P. Geographical fourn al, May, 1897. 



(11) CORNISH, V. Geographical Journal, May, 1898. 



John E. Marr.. 



