202 ^- i^^OTö. 



sharply folded troughs and in extensive, detaclied masses by fre((nent 

 intrusions of all sorts of younger and older graijites, which tlirough 

 horizontal pressure assume at times a gneissose structure, 1 have 

 selected for discussion a number of lines of section where tlie whole 

 complex so far as represented is favourably exposed. The first of these 

 sections/ A-l> in Plate XXY, is that lying furthest towards the south, 

 and is taken along the road that joins the small port of Hirakata 

 on the east, and Kawakami in the Kuji valley, f:)r a distance of 24 km. 

 Froju Hirakata to Yamagoya, the road gradually ascends through 

 paddy-fields. At Yamag(jya, ochry sandstones and grey shales make 

 their appearance, with tliin sea-ms of lignites wldch seem to be of 

 tertiary age, as is indicated by the presence of a few fossil plants,^ 

 such as Sequoia Langsdorfii I^i'gt., Juglans nigella Ilr., Jughuis acuiiiinata 

 Braun., Cdrpuius sp., Acer sp., Vids sp. This is underlaid discordantly 

 by a black, coarse, massive rock ((t lî) with the aspect of a gal)bro, 

 covered with red soils and '' niggerheads." As is usually the case, 

 excellent exposures of this rock were not found, such as to disclose the 

 relation with the adjacent complex. laidcr the microscope it is a 

 typically coarse-grained rock, consisting of hornblende and felds[)ar, 

 with but few remains of augite. The feldspar is grey, contains a 

 number of rods, arranged in some determined direction, and is said to 

 be the cause (jf schillerization, as is explained by Prof. Judd. The 

 light-yellow augite occurs detached within the hornblende in the form 

 of grjiiiis, as if it had been absijrbcd l)y tlie latter — a phen«jmenon very 

 comuKjn in gabbro-diorites. Through weitheriug a p )rl;iou of the 

 feldspar has been removed, and the black components come into relief, 

 so as to produce almost a slaggy aspect. 



1 The positioas of this and other sections are indie ited )jy thick lines, with corresponding 

 letters on the map, in Plate XXII. 



- Explinitory Text (Japanese) to Section KitsuregMwa, pulilished liy the Oeolog-ical Survey 

 of Japan. 



