THE PLEISTOCENE SERIES 651 



of Dover were formed by that subsidence. England was still 

 united to France, but by ;i much narrower tract of land, possibly 

 (inly liy an isthmus joining the Wealden area to the Boulonnais, 

 the invasion of the low-lying country being protected by tin: 

 continuation of the South Downs across the Channel from near 

 Beachy Head to the French coast north of the mouth of the 

 Somme, and by the North Downs between Dover and Calais. 



For an account of the subsequent elevation of the British Isles 

 and of the final subsidence by which Ireland was separated from 

 England and the latter from France, the reader is referred to 

 the author's Building of the British Isles (3rd ed.). The later 

 geographical changes in the Baltic region have already been 

 mentioned, and the history of the Neolithic time belongs rather to 

 the antiquary than to the geologist. For a good account of what 

 was known up to 1880 the reader is referred to Professor B. Dawkins's 

 book on Early Man in Britain. 



REFERENCES 



I See E. J. Garwood, Quart. Journ. Oeol. Soc. vol. Iv. p. 681. 



1(1 See T. F. Jamieson, Quart. Journ. Oeol. Soc. vol. Ixii. p. 13 (1906). 

 3 See Goodchild, "Glacial Phenomena of the Eden Valley," Quart. Journ. 

 Oeol. Soc. vol. xxxi. p. 55 (1875). 



3 See H. Miller on "Boulder Glaciation," Proc. Roy. Phys. Soc., 

 Edinburgh, vol. viii. p. 156 (1884). 



4 For Lincolnshire consult the Memoirs of the Geological Survey, and see 

 Qiiin-t. Journ. Oeol. Soc. vol. xli. p. 118. 



8 On Holderness consult "Geology of Holderness" by C. Reid, Mem. 

 Oeol. Survey, and G. W. Lamplugh in Quart. Journ. Oeol. Soc. vol. xlvii. 

 p. 384. 



8 See Rep. Brit. Assoc. for 1904, p. 272. 



7 St-u C. Reid, Oeol. Mag. for 1880, p. 548, and "Geology of Cromer," 

 Mem. Oeol. Survey. 



8 R. M. Deeley, Quart. Journ. Geol. Soc. vol. xlii. p. 437 (1886). See 

 also Sum. Prog. Oeol. Survey for 1905. 



9 M. Reade, " Drift Deposits of the north-west of England," Quart. Journ. 

 Oeol. Soc. vol. xxxix. p. 83, and "Eskdale Drift," Geol. Mag. for 1893, p. 9. 



10 A. Strahan, "Geology of the Country round Chester," Mem. Oeol. 

 Survey and Quart. Journ. Oeol. Soc. vol. xlii. p. 486 (1886). 



II D. Mackintosh, Quart. Journ. Oeol. Soc. vol. xxxvii. p. 366. 



'- M. Reade, " Drift Deposits of Colwyn Bay," Quart. Journ. Oeol. Soc. 

 vol. xli. p. 102. 



13 See "Geology of Ammanford," Mem. Geol. Survey, p. 188 (1907). 



14 See " Geology of Swansea," Mem. Geol. Survey, p. 118 (1907). 



18 "The Glacial Deposits of N. Pembrokeshire," T. J. Jehu, Trans. Roy. 

 Soc. Edin. vol xli. p. 53 (1904). 



18 Summary Prog. Geol. Survey for 1909, p. 25. 

 7 M. Reade in Proc. Liverpool Geol. Soc. for 1878-9. 



18 See Jukes-Browne, Quart. Journ. Geol. Soc. vol. Ixii. p. 132. 



19 T j, p ococ j {) Geology of the Country around Oxford," Mem. Geol. 

 /, p. 96 (1908). 



