ABT. 2. S. TOKUNAGA. 



Tokyo is situated on the southern extremity of an extensive 

 Diluvial plain of the Kwantö district which is bordered on the 

 north and west chiefly by Palaeozoic mountain ranges, and on 

 the east and south by the sea. On the SE and SSW, there 

 are two long peninsulas, Miura and Kazusa-Awa, both project- 

 ing southward and consisting chiefly of inclined Pliocene tuff 

 layers. Everywhere in the plain, there is found a thick stratum 



Fig. l.—Map of 



Tokyo and its Environs. 



X Fossil locality\ 

 cBx Railway. J 



Scale 1 : 200000. 



of loam underlaid by gravel and sand. This sand is rich in 

 fossils especially in localities to the east and north-east of Tokyo. 

 The greater part of these localities yield fossils of the " upper 

 horizons," while those of the " lower horizons " are found only 



