405 



EVIDEXCES OF THE GEOLOGICAL AGE, ETC. 



those articles. Eigures 1 and 2 represent in outline on a scale of one sixth, 

 the two principal forms of the larger kinds of flint implements, such as are 

 found in Erance, England, and elsewhere, wherever such remains have been 



Fig. 1.— Large Flint Implement from St. 

 Acheiil. Collected hj M. Boucher de 

 Perthes. 



Fig. 2. — Large Flint Implement, probably 

 javelin head, found by ilr. Flower. Nat. 

 Size : 8 inches by 3f iaches. 



found. Eig. 2 is the decisive implement as to the correctness of the position of 

 the instruments in gravels of really geological age, found by J, W. ElowT.r, 

 of Croydon, at St. Acheul, near Amiens, in the presence of Mr. Prestwich and 

 other geologists, in June of last year. This specimen was extracted from a 

 seam of ochreous gravel {2b of section below) twenty feet below the surface. 



The section of the geological deposits at that place as given 

 (in descending order) are 



Mr. Prestwich 



Average 

 thickness. 



1. Brown brick-earth (many old tombs and some coms) 

 with an irregular bed of flint-gravel. No organic re- 

 mains. Divisional plane between 1 and 2 uneven and. venj 

 often indented 10 to 15 feet. 



2a. Whitish marl and sand, with small chalk-debris. 

 Land and freshwater shells (Li/mnea, Succinea, Helix, 

 Bithynia, JPlanorbis, Pupa, Pisidium, and Anci/lus, all of 

 recent species) are common, and mammalian bones and 

 teeth are occasionally found 2 to 8 feet. 



2b. Coarse sub-angular flint-gravel, white with irregular 

 ochreous and ferruginous seams, with tertiary flint peb- 

 bles and smaR sandstone-blocks. Remains of shells 

 as above, in patches of sand. Teeth and bones of ele- 



