Î'KOM KOZUKE, KU, AWA, AND TOöA. 205 



Geulouical Survey. According" to lii.s re[)ort, '^ the lowest Mesozc^ic 

 stratum in tlie vicinity of lvyö:^eki consists of a black shale upon which 

 there is a coarse conglomerate occupying the greater part of the 

 district. The plant-bearing rocks are shales and sandstones which 

 overlie this congl(3merate. Immediately over the plant-bed, there rests 

 the Cretaceous formation witli its characteristic Trujoida pociUifonnis, 

 and in the midst of this formation there peeps out at Okuminodani 

 a dark c<jmpact limestone, exactly similar to the Upper Jurassic 

 limestone of Torinosu in Sakawa, and containing the spines of the 

 same o'landiferous Cidari^ as occurs in it. The relation of this 



o 



limestone to the plant-bed is not exactly known, but from its direc- 

 tion of di[), it seems t(j underlie the latter. 



The fossil locality of Kataji is in a ri\'er bed. Tlie r<jck is a dark- 

 grey, hard, fine-grained sandstone, UKjre or less clayey and easily split- 

 ting into large slabs. Fossils are numerous, but rare in species. Fur- 

 thermore, owing to the smoothl}^ polished and carbonised nature of the 

 vegetable substance, the details of the plants ai'e for the most ])art 

 effaced. The number of species and varieties obtained is 13, auKJUu' 

 whicli I't'copfcris (.TCijlcriana and ZamiopJiijllnm Bacliiaiunit seem to [)lav 

 the most im[)ortant part. 



The fos.iil layer at Tshiseki which is a place very near to Kataji, 

 is exposed in a little stream-bed, and is a sandstone similar to that of 

 the preceding place, although somewhat ligliter-coloured. The number 

 of plants is many, but of species few. Moreover, the state of preserva- 

 tion is exactly like that of Kataji, so that the tw<j localities seem to 

 belong to exactly the same horizon. The number of species here 

 obtained is (i ; ChladopJileliis Xniliorsli is the most fre(juently obser\cd. 



In the upper p;u't o( Tôgodani, a small side-valley of the 

 Kasanogawa, is a cliff which is the fossil locality here. The rock is ;i 



1) On tlic riant-bcai'nuj Ikds of the Rijôscki Basin, I8'J^ (M.S.J. 



