THE GREAT ERUPTION OF SAKURA-JBIA IN 1914. 17 



l)ocI is full (»f Gardiuni (Liiunlicai'diuni) rctusrim L. aud PJtos senticosus 

 L., wliicli are Ixnug used as raw materials for limekilns. 



From the attitude of this bed toward the Tertiary Operculina sand- 

 stone in another region (near Miyazaki', the writer is disposed to 

 consider with Yabé the fossiliferous gravel bed to be of the later Tertiary 

 or the eay'hj Diluvial age. The fossihferous layer is seen at the above- 

 mentioned Kaikata, often intercalating with the lapihi bed, 100 m. thick, 

 wliich contains blocks of ash-stone. The lapilli and fossiliferous horizons 

 {A and B in Fig. 3) are not separable and both are submarine deposits. 

 EAi*i^">f We are, therefore, forced to the conclusion that the 



Age or entire Plateau Formation, now elevated 200 m., must be 



Lapilli 



Plateau of later Tertiary, or more probably early Diluvial ageP 



As the plateau edge, 100 ??2. high, forms cliffs all along the 

 shore as on the Kagoshima side, we have again here the proof 

 ^nn a^^5ay" ^^^^^ KafjosMma Bay is a Jiollow in the lapilli formation, 

 FoKMH,D depressed during the Diluvial period. Considering the 

 average elevation of the Plateau-land to be 230 m. and the bottom 

 of the bay 200 ?j^l or 100 fathoms, the vertical relative displacement 

 of the crust will therefore amount to 430 m.— di, considerable crustal 

 displacement which occurred in a comparatively recent geological 

 period in southern Kyûshû. 



Having dwelt upon the region of Kagoshima City, and of the 



defunct Seto Strait, the writer will now shortly touch on the third 



region of the lapilli land, where the crucial test can be advanced 



to the actual dislocation by wliich Kagoshima Bay was created. 



Geology At the cntrancc of the Bay of Kagoshima stands 



AND DlS- 



IX5CATIONOF tho promineut kouidc (see Fig-. 2) of Kaimon, from which 



theKaimon ^ \ o / 



^^^ the view (PI. IV. Fig. 2) was taken northward to show 



1) The Plateau Formation may perhaps represent both the late Tertiary and the early 

 Dilmiuin without unconformity between them, on the supposition that the physiographic 

 environment remained the same throughout the whole range of time. 



