Plate XXV. 



In this Plate, an attempt is made to illustrate by means of four sections the 

 general geological succession of the Laureutian, Takanuki, and Gozaisho divisions of 

 the Abukuma Archîean, together with the dykes of lampropliyre and pegmatophyre. 

 The positions of the line of section are indicated by thick lines, with corresponding 

 letters on the map, in Plate XXII. 



Section A-B, from Hirakata on the Pacific sea-board through Nakayama to 

 Kawakami in the Kuji valley. (See p. 202 et seq.) 



Section C-D, is drawn westwards from Kadöno, 12 km. west of the city of Taira, 

 across the ridge of Gozaisho, to the west of Takanuki. This is the best profile of the 

 whole region. MG=BG, /. e., biotite-granite. (See p. 204.) 



Section G-H, from Ishikawa to Shimo-Kawabe on the right bank of the Abu- 

 kuma. (See p. 216.) 



Section E-F, from the small hamlet of Kami-Misaka (where a patch of the 

 Gozaisho may be seen) to Ishikawa on the west. (See p. 212.) 



