110 B. KOTO : THE GEOLOGIC STRUCTURE OF 



had been once occupied by the sea, on the bottom of which 

 the Pleistocene sediment had deposited, harbouring a rich fauna, 

 scarcely differing from the now living fauna of the neighbouring 

 seas. -'' 



A brief note on Saleiyar may here be conveniently inserted 

 in connection with Celebes. It is a prolongation in a straight 

 line of the east coast of the south-west peninsula of Celebes, 

 but disjoined from it by the Strait of Saleiyar. The island 

 stretches in a meridional direction and is of narrow east-west 

 breadth. The mountainous, eastern half consists entirely of 

 andésites and trachyte, which had welled out from the meridi- 

 onal fissure, formed at the time when the Gulf of Boni was 

 formed by depression ; while the west is rather flat, being built 

 up of tuffs, sandstones, and marls with Pulvinulina, Orbulina 

 and Globigerina, overlaid by the Neocene coral limestone. Ig- 

 neous rocks form the foundation of the whole island.*^^^ 



Gilolo. 



The likeness in general form of Gilolo or Almahera to 

 Celebes is much closer than to the largest of its sister islands, 

 Borneo, owing to the parallelism of its dislocation-lines — one 

 equatorial, the other meridional — with those of Celebes, tectonic 

 lines which seem to govern also the forms of a few of the neigh- 

 bouring islands. Gilolo, thickly covered Anth forests, is a geo- 

 logically neglected island, and there is too little known about 

 it to give sufficient insight into its tectonic structure. Judging, 



62) Schepman in Wichmanivs paper, ' Die Binnenseen von Celebes ', Petennanns Miltheil- 

 ungen, 1893, p. 18. 



63) Wichmann, ' Zur Geologie der Insel Saleijar ', Natmrkmvlig Tijdschrijl voor Ned. Indië, 



Dl. LIV, p. 1. 



