Geology. — “On the Age of the Tertiary Oil-bearing Deposits of 
the Peninsula of Klias and Pulu Labuan (N. W. Borneo).” 
By Dr. L. Rurren. (Correspondent of the Academy). 
(Communicated at the meeting of February 26, 1921). 
On the geological map of Borneo published by Tx. Posewrrz *) 
a broad band of tertiary deposits is marked along the north-west 
coast of the island and on the island of Labuan. It extends 
from South-Serawak to the Northern point of Borneo. It is not 
known to which subdivisions of the Tertiary these deposits generally 
belong. T. Britor?) who was the first to report the existence 
of coal on the island of Labuan does not say anything about its 
age. J. Mor.ny*) who described the coal formation of Labuan rather 
minutely, is convinced that it is of tertiary age, but he does not 
positively say to which subdivision of the Tertiary it belongs. 
Ta. Posewirz‘), however, records that Morrey considered the tertiary 
of Labuan to be eocene. C. Scumipt also says that nearly all older 
writers took the tertiary of Labuan and of the Peninsula of Klias 
to be eocene and even points to the petrographic analogy between 
the deposits of Klias and the rocks of Pulu Laut, to the South-east 
of Borneo®). A. V. Jenninas*) described eocene Orbitoids from more 
Southern territories of North-West Borneo; they were found along 
the Barram river near Langusan (Batu Gading) and to the South 
of Barram river (Silungen). Nuwron and HorLAND?) demonstrated 
that in these southern territories oligomiocene rocks must occur 
along with eocene rocks; they found in boulders from the Sungei 
1) Ta. Posewitz. Borneo. Berlin. 1889. 
*) T. BeLtor. On the discovery of coal on the island of Labuan, Borneo. Quart. 
Journ. Geol. Soc. London. 4. 1846. p. 50. 
8) J. Morrrey. Report on the geological phenomena on the island of Labuan 
etc. Journ. of the Indian Archipelago VI. 1852. p. 555—573. Cf. also: Quart. 
Journ. Geol. Soc. London 9. 1853. p. 54—57. 
4) Tu. Posewirz. lc. p. 174. 
5) CG. Scumipt. Ueber die Geologie von NW-Borneo etc. Gerlands Beitr. zur 
Geophysik. VII. 1905. p. 121—135. 1 pl. 
6) A. V. Jennines. Note on the orbitoidal limestone of North Borneo. Geol. 
Magazine. (3) V. 1888. p. 529—532. 
7) R. B. Newron and R. Hottanp. On some tertiary Foraminifera from Borneo. 
Ann. and Mag. Nat. Hist. (7) III. 1899. p. 245 — 264. 
