H. BiiUen Newton — Fossils from Singapore. 487 



faulted out to the north of the mass, so that the Keisley Beds come 

 into contact with the rhyolite of Keisley Bank. There is little shale 

 above, and the massive Browgill Shales soon succeed the thin 

 Skelgill Beds. During the movements, owing to the absence of the 

 Dufton Shales by faulting on the north, the Keisley Beds and the 

 calcareous top of the Dufton Shales would be pressed against 

 the hard rhyolite, and would in all probability tend to fold against it. 

 Whatever be the origin of the structure of parts of the Keisley 

 Limestone, the exact position of that limestone in the stratigraphical 

 succession must be regarded as definitely established. The limestone 

 and the more argillaceous beds intercalated with it belong to the 

 Staurocephnlus Limestone group, and occur between the Dufton Shales 

 and the Ashgill Shales. 



II. — Notice of some Fossils from Singapore discovered by 

 John B. Scrivenor, F.Gr.S., Geologist to the Federated 

 Malay States. 



By R. BuLLEN Newton, F.G.S., 

 of the Department of Geology, British Museum (Nat. Hist.), Cromwell Eoad, S.'W. 



(PLATE XXV.) 



Introduction. 



S representing the first fossils yet recorded from Singapore, 

 these specimens are of considerable interest. They principally 

 consist of marine Lamellibranch I'emains accompanied by an obscure 

 indeterminable Gasteropod, and a few fragmentary terrestrial plants. 

 Their condition, however, as casts and impressions renders them 

 most difficult to work out satisfactorily, more especially the shells 

 ■where only external features of the valves are available for study. 

 Some of the specimens, however, retain certain points of structure 

 or contour which appear to have an important bearing on their 

 probable geo'ogical age. The association of land and marine 

 organisms would at once suggest an estuarine or lagoon origin for 

 the beds containing them, more especially as the mollusca belong to 

 genera or families which may be regarded as of shallow-water habit, 

 whilst the plant-remains might be accounted for by the close 

 proximity of land or the transporting agency of river action. 

 Among the shells, that referred to Goniomya is of chief interest, 

 since it belongs almost exclusively to the Mesozoic period, being 

 particularly characteristic of Jurassic rocks and of much rarer 

 occurrence in deposits of Cretaceous age. 



Although exceedingly rare, Goniomya has also been found in 

 Palaeozoic rocks, Krotow having figured and described G. Artiensis 

 from the Russian Permian (Soc. of Naturalists Imp. University of 

 Kasan, 1885, vol. xiii, p. 225, pi. iii, fig. 20), and an unnamed 

 form from rocks of similar age in the Central Himalayas has been 

 more recently recorded by Dr. Carl Dieiier (Palseontologia Indica, 



