270 C. 8CHUCHERT MORRISON AND TENDAGURU FORMATIONS 



The following described species occur in this zone, those in italics 

 being regarded as guide fossils : 



Cephalopoda: 9 species, of which 3 are new. Belemnites, cf. 

 alfuricus, Phylloceras silesiacum, Haploceras elimatum, H. Ico- 

 helli, H. dieneri, Craspedites, and Perisphinctes Meicheri. None 

 of the species pass upward and of the genera only Belemnites 

 and Phylloceras. 



Gastropoda : 8 species. Rhytidopilus, Pleurotomaria, Trochus, 

 Pseudomelania, JSferinea hennipi, Nerinella credneri (comes up 

 from below), and Alaria. 



Bivalves : Apparently but few of the species are described. The 

 more characteristic forms are Trigonia smeei (goes upward), 

 T. ventricosa, GervUlia dentata (goes upward), EripJiyla her- 

 zogi, Protocardia schencM (goes upward). 



Brachiopoda : Te^^ebratula carteroniana. 

 (4) Middle or second dinosaur zone. Limy-sandy marls. About 15 me- 

 ters thick. This zone has the best dinosaur skeletons. Tn one 

 quarry at Kindope about 15,000 separated small bones were 

 secured, with an occasional sauropod bone. Here also were six 

 incomplete skulls. 



Red sandy marl, 3 m. 



Alternating gray and red sandy marls with saurians, 12 m. 

 The following Sauropoda occur here: Brachiosaurus hrancai (also 

 in upper dinosaur zone, but the type specimen here), B. fraasi 

 (also in upper zone, but type here), Dicrwosaurus hansemanni. 

 Two species of armored dinosaurs related to Omosaurus are 

 very common; one is described as Kentrosaurus wthiopicus. 

 Small ornithopods related to Nanosaurus (Morrison) and Hyp- 

 silophodon (European) are very common. In the uppermost 

 and lowermost strata occur rarely six species of marine gastro- 

 pods, among them Nerita cf. transversa, and three species of 

 Pseudomelania ( Oonia ) . 



Just beneath the T. smeei zone at Mtapaia and located between 

 the ribs of a great sauropod were found Thracia incerta, Pho- 

 ladomya aff. protei, Pleuromya tellina, Protocardia schenchi, 

 Astarte cf. supracorallina, Trigonia of costata group, Cucullcea 

 irritans, Modiola perplicata, Ostrea, Gryphwa duho, Pecten 

 {Entolium) aff. cingulatus, Inoceramus (Anopwa), Pseudomo- 

 notis tendagurensis, Perisphinctes. Hennig^^ says the horizon 

 is rather Upper Kimmeridgian or even Portlandian. Mytilus 

 cf. galUennei occurs in colonies at the base of this zone; and 

 in association with sauropod p was found a nest of gastropods 

 (indicated above), one Trigonia, columnals of crinoids and a 

 few Cyrena. Elsewhere Mytilus cf. galUennei. 

 (5) Lower or Nerinea sandstones. About 25 meters thick. 



Yellowish, fine-grained, soft, somewhat limy sandstone, 6-7 m. 



Thin-bedded, fossiliferous, hard, gray, limy sandstone with scales 

 of graphite. 



92 Op. cit., part lii, pp. 184-185. 



