285 



sericitical mica occurs, and fiirtlier |u-isms of toui'inaline and ilnienite. 



The phjUites of the Wai Miha are iisiiallj' softer than those of 

 the Laiigsa, and the microscopic examination proves tliem to be 

 different. Because thin dark, blackish-grey strata alternate with light 

 ones that are rich in quartz, the folding can ver^' distinctly be 

 observed f^tig. 2). The former are composed of closely compressed 

 aggregates of light-green sericite. as a consequence of the folding 

 the laminae were bkewise bent. Little flakes of brown iron-ore (limonite) 

 are abundantly spread. The lighter strata chiefly consist of aggregates 

 of quartz, containing very few fluid inclusions. Further light greenish 

 mica-lamellae are discerned, floating as it were in the quartzmass 

 that is as clear as water. In other phyllites, besides grains of ore, 

 many particles of carbon are spread and further prisms of tourmaline 

 and needles of rutile. 



At the foot of .Sangeang, situated on the upper-course of the Wai 

 Miha, occurs a black phyllite containing numerous hexaedrons of 

 jiyrite having a diameter of 2 mm., it has great resemblance with 

 the rock collected by R. D. M. Verrkkk on the north coast in the 

 neighbourhood of Cape Damar ^). Under the mici'oscope the eye 

 distinguishes light strata containing much quartz, alternating with 

 (piite dark ones, which are filled with carbonaceous matter in such a 

 way that even the thin sections remain in some places Opaque. It 

 appears that the grains of quartz contain few and sinall fluid-inclu- 

 sions. The rock moreover contains light-greenish laminae of sericite, 

 needles of rutile and — along the fissures — - particles of limonite. 



If the quartz predominates a piujlHtcqiiartzite is formed. 



A similar rock is lii<:ewise found as a rock near the Wai Miha 

 and consists chiefly of whitish-grey quartz of a greasy appearance, 

 interwoven with strata of ph> Uite. At last there is still a houldtr- 

 phijUite in itself normal and containing small boulders of white 

 (piartzite and of siliceous limestone. The rock forms a counterpart 

 of the boulder-clay slate described by E. Kalkwosky '). 



Near the upper course of the Wai Miha was found, besides the 

 rocks described above, a waterworn specimen of cla}j .slate which 

 is strongly folded and apparently belongs to the same system of 

 strata as phyllite. Microscopically it behaves as a common rooling- 

 slate, contains as the latter numerous needles of rutile, a few prisms 

 of tourmaline, and black widely distributed carbonaceous matter. 



1) MolukkenVerslag, p. 2^23. 



2) Übei- Geiöllthonschiefer glacialen Ursprungs im Kulm des Frankenwaldes 

 Zeitschr. d. D. geolog. Ges. 45. 1893, p. 69-86. 



