CONTEXTS. 227 



PAGE 



mate, !•")() — SuniDiaiy l-jl 



PAKT lir. Petrography ,152 



§ I. Tin-: TvAVAS op the PuE-insTORic Coxes 152 



.1. The lai-a^i of KUa-daU 152 



a) To]wgr:ipliic features, 152 — Northern slope, 152 — 

 AYestern slope, 150 — The volcanello of Furuhata, 15o 

 — The ao'glouierate bed that imderlies the North Cone, 

 153 — .Vtago-yama of dubious origin, 154 — The volcanic 

 plug (^f Hikino-hira, 154 — Southern side, 155 — The 

 ^Vkashi-Gongeii liill, 155 — Gongen-yania and Sono-yania 



on the eastern side 155 



h) l'etrographi(^ cliaracters 155 



B. T/ic Kabano lava (^iiorthcni side) 158 



a) i\Iode of occurrence, 158 — The age doubtful -.159 



h) Pétrographie characters 159 



G The Jfinanti-dake and Nahi-dakc lams 160 



a) ]\ro(le of occurrence, 160 — ^The Naka-daké tlow . . . . 161 

 />) Pétrographie characters, 161 — (i.) The Minanii-dake 

 lava, 161 — (ii.) The Kannon-zald lava, 162 — (iii.) Tlie 

 Naka-daké and the Nagasaki headland area 162 



§ II. The Lavas of the Historic Period 163 



A. TJte lavas of the Bummel eruption, 1471-1476, including the 

 Xahé-yama and Yebino-tsuha adventives 163 



a. The Urano-mayé lava-field of 147 1 (eastern side.) . . 163 



a) General 163 



h) ]\Iode of octcuri'cnce 164 



(') Pétrographie characters 165 



ß. The Nabé-yama and Yebino-tsuha homates . . . . 165 



a) The Nabé-yania homate 165 



b) The Yebino-tsuka knob 166 



B. The Bynbu-hira lava-field of 1475-1476 166 



