A DESCRIPTION 



OF THE 



FOSSIL EOHINOIDEA 



OF 



WESTERN BIND. 



Fasciculus 4.— THE NAEI SERIES (OLIGOCENE). 



Plates XXXIX.-XLIII. 



I. Introductory Remarks on the Nari Series. 



The geographical and geological position of the Nari series has been described on a 

 former page* of this description of the Tertiary Fossil Echinoidea of Sind, and the 

 details of the succession of its strata also. It appears that this thick series is to be 

 divided into an upper and lower group, the first attaining the great thickness of 4000 

 to 6000 feet, and the latter from 100 feet to 1500 feet. The lower group, which is 

 fossiliferous and contains the Corals already described f , rests conformably on the 

 underlying Khirthar series. Its very fossiliferous strata are not more than 100 feet 

 thick ; and there is a clear biological break, for Nummulites begin to be scarce in 

 species and Orbitoides come in. 



The Upper Nari series is unconformable to the lower, and whilst in some areas 

 there are marine fossils indicated by the presence of Orbitoides papyracea, in others 

 there are sandstones which have only yielded plants. 



The commonest Nummulite is Nummulites Garansensis ; and the most important 

 Corals common to the Nari and the European equivalent strata are : — Trochocyathus 

 cyclolitoides, Ed. & H., of Rosazzo in Friuli, and S. Giovanni Ilarione; Stylophora 



* Pasciculus 1, p. 4. 



t Duncan, Pal. Ind. Ser. XIT., Fossil Corals of Sind. See also Medlicott and Blanford, 'Geology of 

 India/ vol. ii. p. 459. 



2l 



