1853.] MOTLEY — GEOLOGY OF LABUAN. 57 



minuted shells. Among the more perfect shells found in this deposit 

 Mr. Motley has recognized — 



Species. Species. 



Pyrula 1 



Turbo ? 1 



Cerithium 3 



Fusus 1 



Oliva 1 



Terebra? 2 



Area* 1 



Solen 1 



Terebratula ? 1 



Bivalves, uncertain . . 7 



Together with these are leaves closely resembling those of the 

 common Mangrove, fragments of wood, traces of Fucus?, tracks of 

 Crustaceans, and borings of Annelids. 



Near the Mombedi Creek, a thin bed of sandy shale, exposed in a 

 low cliff on the beach, is very full of impressions of two species of 

 Pecten and an Ostrea or Avicula. 



Coal-beds similar to those of Labuan exist also on the western 

 coast of Borneo, as far north as Mengkabong and at Gantisau, in 

 Pulo Gaya ; and to the south they are found near the town of Bruni, 

 where several seams of excellent coal occur, also on the Barram, 

 Bintulu, and Rejang rivers. 



Mr. Motley considers it probable that the granitic range running 

 through Borneo, in a south and south-westerly direction from the 

 Keena Baloo, may constitute the eastern limit of this extensive coal- 

 field, which, he suggests, may have been formed in the estuary of 

 some great river or system of rivers, draining some ancient continent 

 to the northward ; occasional floods having brought the materials for 

 the pebble-beds and conglomerates with which the coal-seams, shales, 

 and sandstones are frequently interstratified. Such a river, he adds, 

 may have flowed from the high land of Central Asia over what is now 

 the basin of the China Sea, and in the course of ages have deposited 

 in its vast delta the Bornean coal-field, which was afterwards tilted f 

 into its present position by the eruption of the vast granitic mass of 

 Keena Baloo. 



Mr. Motley's communication contains also much general informa- 

 tion on the topography and geology of Labuan and its islands (a 

 MS. map of which accompanies the paper), and the neighbouring 

 parts of Borneo. 



Note. — For notices of the coal of Bruni and Labuan ; of the 

 eastern side of Borneo, near the River Coti or Gooty ; of Junk- 

 China, an islatid on the coast of the Malay peninsula of Formosa ; 

 and of the S.E. coast of Sumatra, see Quart. Journ. Geol. Soc. vol. iv. 

 p. Ixi, xcvi, and p. 50 ; and Journ. Ind. Archip. 1847, vol. i. pp. 80, 

 90, 145, 153, &c. A notice also of the coal-workings in the north- 

 ern part of Formosa is given in Mr. Bellot's MS. communication in 

 1847. 



* Different from that at Tanjong Kubong. 



\ In Pulo Daat, Pulo Loobedan, and the neighbouring coast, the rocks are 

 nearly vertical ; but at P. Loobedan and elsewhere there are considerable local 

 contortions. At Bruni, to the south, the dip is nearly north and very steep, as it 

 is also at Tanah Merah, about 20 miles north of Labuan. At Mangatal and Meng- 

 kabong also the dip is northerly, but at a less angle. 



