128 



middle and highest in the North and which in the North East 

 even develops hills. At the centre of this quartz island a diabase 

 triangle rises, formiug a complex of hills which is especially con- 

 spicuous in the North. 



The quartz-diorite part eastward of the line Belashi - - Cashuntie 

 is still partly covered with quaternary riff-chalk, although not 

 nearly to such an extent as is indicated by Martin in his map. 

 There are fairly high hills of quartz-diorite (Paloe Marga 78 M., 

 Seroe Preto 61 M.) between Savaneta and Jamanota and this 

 rock also rises to the surface in many places between Savaneta 

 and Fontein. Part of the South coast of West Aruba is occupied 

 by a large broad seam of riff-chalk, which in some places (Boeroa- 

 koe 21 M.) reminds one of the limestone hills on the South coast 

 of Curagao. The Canashito is a more inwardly situated limestone 

 ridge. From the plain of West Aruba rises isolated the conical 

 Hooiberg, 164 M. Also the Seroe Plat, 94 M., is an isolated moun- 

 tain and is surmounted by a calcareous table-land. 

 The diabase hilly complex, extending over a territory, bordered 

 by lines from Matavidiri to Belashi, from there to Boca Prins 

 and then along the North coast to Matavidiri, has a number of 

 high tops, among them Ariekok 175 M. and Jananota 188 M. 

 From these tops the country slowly descends to the South and 

 West and the whole landscape is dominated by cup-shaped hills, 

 separated by gently sloping valleys; in some places we find per- 

 pendicular walls. On the North coast we meet in a few places 

 the same limestone terraces which exist on the West coast of 

 Curasao. 



Bonaire. 



The West point of the island lies at 68 12' W. Long, and 

 12 14' N. Lat., the most Southern point at 68 24' W. Long. 

 and 12 13' N. Lat. The greatest length of the island is 36 kilo- 

 metres, its surface about 240 square kilometres. It consists of 

 a quaternary limestone formation, pierced in two places by moun- 

 tainous complexes of cretaceous origin, diabase and glimmer por- 

 phyrite. 



A limestone mountain-range of semi-circular shape separates the 

 Rincon plain and the part to the West of this latter from the 

 other non-calcareous part, which extends over a much larger 

 surface than Martin's map shows. 

 The remaining part of the island East of this limestone complex 



