THE MALAYAN AECHIPELAGO. 95 



with Sermatta. Tertiary sandstones with a nucleus probably of 

 crystalline schists make up the island of Babber.* The majority 

 of the Tennimber group belong to the Tertiary and Eecent 

 coral formations ; and a crystalline limestone and quartzite have 

 been reported to occur in Seera, one of the above group. In 

 the Kei Islands, K. Martin mentions an occurrence of the 

 Eocene limestone with Älveolina; Koor resembles it in its geo- 

 logy. Watu-Bella Island seems to be built up of crystalline 

 schists (amphibolites and quartzites), while Tjoor forms an ex- 

 ception, being a volcanic island, an eruption in which in 1559, 

 caused a great damage to the plantations. Ceram-Laut, Suruaki, 

 Goram, and Manawoka consist of crystalline schists, while the 

 minor islands among them are of Recent coral formation. Mana- 

 woka may possess an extinct volcano, but this is not quite certain. 

 Ceram (Serang) has, according to K. Martin,'*^ an equatorial 

 mountain, at least in the western half, is cliffy in the north, 

 and in the south is composed of hills of crystalline schists with 

 Alluvial plains around coves. High mountain limestone (the Buru 

 limestone of Martin), and another complex of limestone, either 

 Quaternary or Tertiary, seem to have a wide distribution, espe- 

 cially in the Buano island. Neovolcanic rocks are scarce, except 

 in the south point of Huamaul or Small Ceram. Wichmann^^^ 

 cites the occurrence of granite, syenite, quartz-porphyry and mica- 

 porphyrite. The northern half of the sister island Buru^°^ appears 

 to be mountainous, and made up of crystalline schists. Sandstone, 

 overlaid by a Mesozoic (Jurassic) limestone with Aptychus and 



* An occurrence of the Jurassic limestone is noticed by Suess, in his ' Das Antlitz der 

 Erde', Bd. II, p. 208. 



28) Verhandl, d. Gesell, f. Erdkunde z. Beiiin, Bd. 21, S. 513. 



29) ' Beiträge zur Geologie von Ostasiens etc.', Bd. II, S. 201. 



30 j Martin, loc. eil. (28). See also ' Keiseu in den Molukken', Leiden, iSOi, S. 3G9, footnote. 



