485 



of hiils eoiisisting of limestone, a,iid in tiic plftin itself a few isolated 

 hills of limestone ^). 



Up to the present moment only yonnger tertiary and post-tertiarj 

 ernptive rocks were fonnd in the entire sonthern half of Western 

 Flores. In the ntmost sontli-western part i. e. in the Madui-a Bay tiie 

 Siboga Expedition collected in 1899 rocks that on more exact examin- 

 ation proved to be angite-andesite. According to D, F. van Braam 

 Morris Mount Sosa J 212 m. high farther westward 8°46' S, 129°58' E; 

 must be a still active volcano ^). By the volcano called by him 

 Toda (5000 ft.) will most likely be meant Potjo Wai 1740 m. high, 

 the highest mountain of the province of Todo. Potjo Leo 2696 m. 

 high was already called a volcano by J. P. Freyss *) and is still 

 active according to Braam Morris. J. W. Meerburg, who marched 

 along its slopes in 1890, does not remark anything in this regard '') 

 Potjo Lika (2212 m.) situated in the immediate neighbourhood to 

 W.N.W. is, according to Pannekoek's ma[), volcanic, and the same 

 can most likely be said of Potjo Rea (2006 m.) and Mata Wae (2077 m.) 

 rising at a short distance. J. W. Retgers has microscopically examined 

 the rocks collected in this region by J. W. Meerburg.*) He mentions 

 pyroxene-andesite from the Wai Ren a near Dégé, quartz-augite-andesite 

 of the same place, qnartz-hyperstene-andesite and hornblende-hyper- 

 sthene-andesite from the Wai Lédé near Ruté at the N.E. foot of 

 Potjo Lika, hornblende-hypersthene-andesite from the Wai Soki, 

 between Lidi and Todo, pyroxene-andesite from the Wai Madjo near 

 Todo, hornblende-pyroxene and hornblende-hy perst hene-andesite from 

 the Wai Man, a tributary of the Mésé, 9,4 kilom. N. from Nanga 

 Ramo. Toren Island 780 m. high (8°54' S., 120°15,4' E.) «) situated 

 to the south of tliis place is most likely also of volcanic origin. 



According to Pannekoek's map the whole region situated between 

 Nango Ramo and the Aiméré Bay, the frontier of Western Blores 

 is of a volcanic nature. It is wellknown, that Mount Komba (926 m.) 



1) Verslag van de reis van den controleur Hoedt naar de Noordkust van West* 

 Flores, Tijdschr. v. Ind. T., L. en Vk. 36. Batavia. 1893, p. 292. 



2) Nota van toelichting behoorende bij het contract gesloten met het landschap 

 Ëima. Tijdschr. v. Ind. T. L en Vk. 36. 1893, p. 186. 



3) Reizen in Manggarai en Lombok. Tijdschr. v. Ind T. L. en Vk. 9. Batavia 

 1860, pp. 506-507. 



*) Dagboek van den controleur J. W. Meerburg, gehouden gedurende zijnereis 

 door het binnenland van Manggarai. Tijdschr. v. Ind. T. L. en Vk. 36. 1893, p. 290. 



") Mikroskopisch onderzoek van gesteenten uit Nederl. Oost-Indië. Jaarboek van 

 het Mijnwezen 24. Amsterdam 1895, Wet. ged., p. 135. 



^) Also called Pulu Ramo, Nusa Sigo, Gih Enta or Embuanga, 



32* 



