258 ^ ^^'^^• 



a clear, uiistriped feldspar in the hornblende zone, which I also place in 

 the plagioclastic group. 



The above notes chiefly refer to the rock brought from Kamada, 

 1 ri south-west from Takanuki. Having given a general description 

 of the amphibolites, we may now briefly consider their many modi- 

 fications. 



B a) Titanite-Biotlte-Amphibolite. 



This is the commonest type found all over the region included 

 within the terrain of the present series, so that the citation of its 

 occurrences would be quite redundant. It is thin-banded, and has a 

 plane-parallel structure. Sometimes, however, massive modifications 

 are not wanting; still their transversely fractured surface always shows 

 a banding of the white, feldspathose, and black, hornblendic zones. 

 The hornblende is brown and pleochroic, the titanite-wedges and the 

 lamellae of biotite are interposed between the bacillar amphiboles. 

 The clear, ])olygonal feldspar is of a rather large size. 



The interbanding white zone is in the main made up of the last 

 mineral, and its grains are minute. Intermixed with these there are 

 chains of titanite-grains with the drop-like titaniferous iron. The best 

 exposures are found at IShimo- Yamagami near IVIatsukawa. 



\) bj Titcmite-Salite-Ainphibolite. 



This rock, so far I am acquainted with it, is only found at Ka- 

 mada, and its general description has been already sufiiciently given 

 in the preceding pages. It is a deep- black, somewhat granular, 

 thick-banded schist, alternating with the light-green liands (2-8 cm.) 

 of salite. The hornblendic zone is almost entirely made up of a bacil- 

 lar amphibole ; and through weathering a glittering, gold-yellow 

 biotite comes to view on the surface of the rock. 



