504 PEOCEEDINGS OF THE GEOLOGICAL SOCIEXY. 



are few either natural or artifical cuttings througli these strata 

 anywhere. 



In the uppermost stratum, No. 1, Section G, I found a number 

 of Astarte Longlandsiana. In one small mass of rock I obtained 

 upwards of twenty specimens of different sizes. In a small kloof 

 near the top of one of the hills, near the Modder Drift, Col. Rocke 

 and I discovered a place where this fossUiferous bed was exposed, 

 containing innumerable remains of Pinna Atherstonei. I have 

 never seen such a collection of these shells at any other spot. From 

 this circumstance we named it " Pinna Kloof." Trigonia Her- 

 zogii is also numerous here. If these rocks prove to be, as I sup- 

 pose, the equivalents of those at McLoughlin's, there is to be noticed 

 that, whereas at the latter place the whole series occupies a space of 

 but some 40 or 50 feet in thickness, here, above the Modder Drift, the 

 fossiliferous beds are not only thicker themselves, but are separated 

 by wider spaces of non-fossiliferous rock, it being a height of some 

 200 or 250 feet from the lowest stratum to the top of " Pinna 

 Kloof." 



I was not able to make any satisfactory observation of the dip of 

 these lower rocks during my visit ; but some four or five miles to 

 the west, on the plateau over which the road passes from the Bay 

 to Tunbridge's, I found that the dip of the upper sandstones was at an 

 angle of 9°, with an apparent direction of 32° E. of S., taking a 

 slope from the higher portions of Grass-ridge towards the coast. 

 These latter rocks, where I obtained this observation, are at a higher 

 elevation than those examined along the banks of the Sundays 

 River ; but whether the dip here taken is likely to indicate the true 

 dip of the lower rocks under notice I am not at present able to 

 say. A quantity of fossil wood was strewed among the debris of 

 these strata, although I did not find any in situ ; and Dr. Rubidge 

 informed me that he had found Ammonites in the same locality. 



As a recapitulation of the foregoing, I would observe that the 

 facts here stated, imperfect as they are, and modified as the con- 

 clusions here arrived at no doubt may be with increased informa- 

 tion, show that most of the fossiliferous bands in the different 

 localities of the " Uitenhage Formation " form portions of a series, 

 and are not continuations of the same zone, as was once thought. 

 This, I believe, wUl be proved to be the case, very convincingly, as 

 soon as their fossils are more accurately tabulated. Thus, in No. 

 13, at the old road near Rocke's Bluff, Astarte Bronnii is in very large 

 numbers, both valves of most of these shells beautifully perfect. This 

 is the only band from which this Astarte, as far as I can learn, has 

 been obtained, while I am not aware that a single Trigonia has 

 ever been found there. In No. 12, Exogyra imhricata is exceed- 

 ingly numerous ; but not one specimen of Astarte Bronnii has been 

 discovered in it. Here one or two Trigonia; make their appearance, 

 but are very scarce ; while in No. 11, near the drift, on the old 

 road to Grahamstown, Trigonia TIerzogii becomes one of the cha- 

 racteristic shellg.. In No. 11 also, Cticulla^a Eraussii, Astarte Her- 



