CORRELATION OP TENDAGURU SERIES 275 



possibly the brackish-water marshes along the coast and rivers, feeding on 

 aquatic land-derived plants.*^ 



The present writer believes that the entombment of dinosaurs in the 

 African Tendaguru clays and sands shows that the sauropods at least 

 are found in their natural habitats, and that they were not killed "in 

 troops'^ or through cataclysms. On the contrary they were wading around 

 and feeding in the fresh- and brackish-water marshes, the areas of their 

 burial, and into these marshes the rivers were unloading their sediments 

 and the cadavers of the drowned reptiles — the armored dinosaurs, and 

 the ornithopods that lived wholly on the higher and dry land. It seems 

 probable that these aggrading areas along the ocean front were rather 

 brackish- than fresh-water marshes, because of the great scarcity of 

 theropod skeletons and pulmonate snails, and the complete absence of the 

 fresh-water bivalves, the naiids. The presence of many armored dino- 

 saurs and small ornithopods, all dismembered, with the bones in linear 

 liorizontal arrangement, is evidence in favor of river transportation into 

 the areas of the marshes. We have here, then, reptiles associated which 

 originally lived in different though closely approximated habitats. 



CORRELATION OF THE TENDAGURU SERIES 



Correlations hy the Germans. — In Part II of the German publication, 

 Ilennig summarizes the various correlations made by previous geologists 

 and paleontologists, and of these only one will be restated. The inverte- 

 brate fossils collected in 1907 by Professor Fraas have been studied by 

 Krenkel.*^ His conclusions are that the great majority of the fossils are 

 indicative of Neocomian or early Lower Cretaceous time, or more spe- 

 cifically, that the Mediterranean Valanginian, Hauterivian, and Bar- 

 remian are represented. He adds that there may also be present in 

 southern German East Africa strata of Cenomanian time, but that the 

 fossils are not good enough to make this certain. On the other hand, 

 nothing as to the presence of Jurassic was discerned. 



According to Hennig,^^ the older ^^orkers with African fossils held that 

 there is here a complete break between the Jurassic and Lower Cretaceous. 

 The more recently collected marine faunas have, however, now established 

 the fact that there is a complete transition from the Jurassic into the 

 Lower Cretaceous, and this is also confirmed by the nature of the strati- 

 graphic sequence. 



*oOp. cit., part ii, p. 260. 



*i E. Krenkel : Die untere Kreide von Deutsch-Ostaf rika. Beitr. zur Pal. u. Geol. 

 CEsterreich-Ungarns, vol. 23, 1910, pp. 201-250. 

 *2 Hennig : Op cit, part ii, pp. 3, 10. 



