TEKTIARY LlMEiSTOXE NEAR SAGARA, TÖTOMI. 



23- 



Aloij''' il brook, ou tlie north-western side of tlie Mekamiyanin, there is 

 ex[)Osed a Tertiary formation of sandstones and shales, to which 

 reference will be made later on, which strikes nearly x\-S. and dips to 

 the east at an angle of o5°. On the north-eastern side of the hill is also 

 seen an alternation of shale and sandstone quite similar to the others, 

 the strike of which is nearly XE. and the south-easterly dip very high, 

 ^iloreover, to the west of the hill. bey<Mid a, very narrow rice-iield is 

 laid bare alouu' a In'ook another .similar alternation Avith uorth-westerlv 

 inclination. At the Okamiyama, on the other hand, any such ex- 

 posures as the above are concealed by the talus of limestone blocks 

 on all f>ides of it. There is, moreover, l)ut little outcrop of rocks 

 in the neighbourhood, with the exception of a very limited patch 

 laid l)are at Oiwa. about 150 m. east of the hill, Avhere sandstone 

 and shale are found in a fragmentary state in association with the 

 limestone. So far as my observation goe.>, it seems most pro- 

 bable that a series of sandstones and shales rests directly upon 

 the limestone, and that the latter appears sporadically ihmi 

 underneath that series and still vourj^'er strata, as in the hills here 

 under consideration. 



The accompanying hgures will perhaps render the mode of 

 occurrence of the limestone clearer than any description. 



NWW 



%/> 



See 



Fij,'. 1. Ideal section of the Meljamiyama from SEE. to XWW. Scale 1 : 7,000. 

 ^ limestone quarries. s. sandstone and shale, 



a. rice-field. , p. much younger Tertiary. 



