L. F. Spath- — Jurassic Aviononites from East Africa. 311 



Easington than at any other point, and a thorough examination of 

 this deposit should finally settle the question as to whether raised 

 beaches do occur on the coast of north-east England. I should be 

 glad to give any further particulars to any geologists who may desire 

 to examine this deposit, and if it can be arranged should be pleased 

 to accompany them to the exposure. Any expression of opinion 

 regarding the mode of origin of this deposit after it has been 

 examined would be welcomed. I have placed a collection of shells 

 from it in the Sunderland Museum, and have also given some 

 specimens to the Curator of the Hancock Museum, Newcastle. 



On Jurassic Ammonites from East Africa, collected by 

 Prof. J. W. Gregory 



By L. F. Spate, B.Sc, F.G.S. 



(PLATE V.) 



n^HE small but very interesting collection of Ammonites described 

 -^ in the follovsring pages was obtained during the summer of 

 1919 by Professor J. W. Gregory, to whom the writer is indebted for 

 permission to study them. There are seven specimens altogether, 

 three of them fragmentary, and all probably originally pyritized, 

 but now converted into limonite. Though immature or fragmentary, 

 all the specimens were seen to have indications of suture-lines, so 

 that their study promised definite results even if, at first sight, it 

 was difficult to place the fauna in the geological sequence. Super- 

 ficially, there was greater resemblance to the Lower Cretaceous 

 fauna (with Phylloceras of the heterojjhyllum. group and Lytoceras 

 quaclrisulcatum) described from East Africa by Krenkel ^ than to 

 the Sequanian fauna of Mombasa, recorded by Dacque,^ and a large 

 series of which is preserved in the British Museum (Nat. Hist.). 



On closer investigation, however, and after preparation of the 

 suture-lines, it became evident that the age of the Ammonites 

 corresponded with the presumed stratigraphical position of the beds 

 which yielded them, namely "Bathonian, or post-Bathonian, but 

 pre-Sequanian ". Professor Gregory adds (in litt.) that the Ammonite 

 beds [limestones and shales] are separated from the fossiliferous 

 Sequanian by a considerable thickness of strata. The corals of the 

 limestone immediately underlying the Ammonite-bearing beds, 

 according to Professor Gregory, are not of the same genera as the 

 known Bathonian corals of East Africa. Also they are not the same 

 species as those of the Bathonian of Kutch, and Professor Gregory 

 was at first disposed to put them as post-Bathonian. On the other 



^ " Die Untere Kreide von Deutsch-Ostafrika " : Beitr. Pal. Geol. Ost.-Ung., 

 vol. xxiii, pt. iv, 1910, pp. 201-50, 4 plates. 



' " Dogger und Malm aus Ostafrika " : ib., vol. xxiii, pt. i, 1910, pp. 1-63, 

 6 plates. 



