56 PROCEEDINGS OF THE GEOLOGICAL SOCIETY. [Jan. 5, 



the bed ; sparingly among them, but more abundantly in the upper 

 half, are found a good many casts of Bivalves, much resembling some 

 species of TJnio. The calcareous part of the shell is always removed, 

 but the membranous epidermis appears to remain, generally as a 

 sort of varnish upon the cast, but occasionally free in the cavity for- 

 merly occupied by the shell. The casts are of ironstone, and are 

 usually much fissured. 



feet. in. 



25. Coal, about 1 ft. 6 in., — but at one point inland nearly 5 



26. Blue clay with ironstone about 50 



27. Coal about 1 2 



28. Blue clay about 6 



29. Sandstone. 



30. Above all these is another series of sandstones, similar to those below the 



carboniferous clays, but rather harder. About the middle of these sand- 

 stones is a tolerably continuous, though not quite regular, course of water- 

 worn blocks of coal, some as heavy as 2 cwt. They lie sometimes in groups 

 and sometimes several yards apart, and have been traced at several points 

 inland. 



31. A short distance above these sandstones is another small vein of coal, occa- 



sionally cUvided by a narrow band of stone. 



32. Further along the cliffs* occurs an unlaminated blue shale, divided by several 



bands of a very hard siliceous indurated clay, full of nodules of siliceous 

 ironstone ; with shells and Algae. 



Here Mr. Motley has found the following fossils. In the shale — 



Species. Species. 



Cardium 2 



Tridacna 1 



Area 1 



Ostrea 1 



TeUina 1 



Univalves, uncertain. . 4 



In the hard bands, chiefly as casts- 



Murex 1 



Turbo ? 1 



Cerithimn or Terebra 2 

 Serpula 1 



Pecten 1 



Ostrea 1 



Bivalves, uncertain . . 2 



Narrow carbonaceous ribands intersect the clay in every direction, 

 and appear to be the remains of Algce. 



An almost exactly similar deposit to this bed of shale, and con- 

 taining very similar fossils, Mr. Motley observed in the bed of the 

 Tukuruk River, near Bruni. 



In the south-eastern part of the island, the sandstones and clays at 

 Pasley Point and Tanjong Tarras, containing occasional thin seams of 

 coal with fossil resin, dip N.b.E.|E. at an angle of about 25°, accord- 

 ing to Mr. Bellot's section of this part of the coast, presented to the 

 Society in 1847. In this neighbourhood, north of Tanjong Tarras, 

 Mr. Motley has found a fossiliferous sandstone, about half a mile 

 south of Mombedi Creek, and less than a mile inland [and therefore 

 possibly on the strike of some of the beds about the middle of Mr. 

 Bellot's section]. This is a soft, light brown sandstone, having a 

 strong smell of iodine. It is divided by partings composed of com- 



* At about 1500 yards beyond either bed No. 24 or No. 31, — see Journ. Ind. 

 Arch. ;. c. p. 567.— Ed. Q. G. J. 



