LOFTUS TURKO-PERSIAN FRONTIER. 267 



anj'^ other observed in this pecuUar formation, inasmuch as they con- 

 tain fossils (which are however nearly all in the form of casts) . 

 In the bed No. 2 of the N.W. Section we have 



The jaw and teeth of 



Natica. 



liucina. 



Sphcerodus ? 



Mytilus ? 



Nucula ? 



Remains of Crustaceans. 



Astarte, 2 sp. 



Chama. 



Balanus. 



Modiola. 



Several Bivalves ; genera 



Murex. 



Pholas ? 



undetermined. 



In beds Nos. 2 and 4 of the S.E. Section are 



* Remains of Crustaceans. * Astarte. * Mytilus ? 



* Balanus. * Lucina. * Anomia. 



Flustra. Cardium. Several Bivalves ; genera 



* Natica. Cardita. undetermined. 

 Cerithium. Pinna. Serpula. 



Oliva. Area, 2 sp. Astraea. 



Calyptraea. 



Note. — The species marked (*) are identical with those from the former 

 section. 



The outcrop of the beds immediately in juxtaposition with the 

 limestone is, as I have said, entirely concealed by limestone-debris, 

 so that I am unable to state if any fossils are common to the two 

 formations. In the first visible stratum of the limestone the fossils 

 are perfectly distinct from those of the newer marls, and consist of 

 Nummulites Biaritzensis and microscopic forms peculiar to the Num- 

 mulitic formation. 



Section at the Tauk i Girrah Pass. — The only locality at which 

 there is anything like a gradual passage from the nummulitic beds to 

 the superimposed gypsum-marls is at the summit of the Tauk i 

 Girrah Pass, on the descent from the mountainous region of Persia to 

 the plains of Zohab. 



The following descending section is there presented : — 



1. A succession of calcareous and variegated marls, with thin 



beds of fine yellow sandstone at intervals ; the last most 

 abundant in the upper part of the series. These beds are 

 of great thickness and are unfossiliferous. 



2. Yellow calcareous marl, filled with a crenulated Ostrcea, and 



a small Anomia 2 ft. 



3. Hard calcareous marl, with supposed Cyrencel, crushed to- 



gether in mass : none distinct I ft. 



4. Soft blue marl, containing fossils identical with those from 



the fossiliferous beds above described at Kirrind 1 ft. 



5. Hard compact limestone, filled with exceedingly small pebbles 



of red chert; of considerable thickness, and containing 

 small Nummulites Biaritzensis, 



This sequence appears to be complete ; but the organic remains 

 are characteristic of the separate beds in which they occur, and do 

 not pass into any others. 



