Mr. Bain on Fossil Remains in South Africa, 



55 



ish sandstone containing a number of blue calcareous nodules. Further north, the 

 road traverses a second valley of elevation, and at the fortieth mile is the signal- 

 tower of Dans Hoogte, standing upon a vein of greenstone. 



1. Cradock. 



2. Twee Tafel Bergen. 



3. Tarka R. 



4. Tarka Mountains. 



5. Winterberg Peak. 



6. Post Relief. 



". Mount Didima. 



8. Blinkwater. 



9. Mankazan R. 



10. Somerset Fort. 



11. Fort Beaufort. 



12. Dans Hoogte. 



13. Kat R. 



14. Little Fish R. 



15. Great Fish R. 



16. Ecca Heights. 



17. Ecca R. 



18. Graham's Town. 



19. Gualana R. 



At the further distance of six miles we arrive at Fort Beaufort, originally only a 

 military post, but now a thriving town. It stands in a sort of basin surrounded by 

 picturesque hills, on the right bank of the river Kat, one of the tributaries to the 

 Great Fish river. Its height above the sea is about 1700 feet. 



It is immediately to the north of Dans Hoogte that the district begins which has 

 furnished the remains of the remarkable bidental reptiles, the discovery of which 

 has induced me to make the present communication. Many of these are found in 

 the basin of Fort Beaufort, and also at the Mankazan Post, twenty miles from that 

 Fort in a north-easterly direction. The prevailing rock of this district is a slaty 

 sandstone, readily disintegrating, and containing nodules of a greyish-blue argillo- 

 ferruginous hmestone, resembling septaria. In these nodules the fossils are found 

 thinly coated with limestone, the bone and its stony matrix being often so tho- 

 roughly amalgamated as to render it difficult to distinguish between them. At the 

 Mankazan Post, in the same strata which furnish bidental remains, my friend Mr. 

 Borcherds has lately discovered small bivalve shells. I had not procured speci- 

 mens of these shells when my collection was shipped for England. 



i2 



