1868.] STOLICZKA HIMALAYAN JURASSIC ROCKS. 507 



to many readers of this Journal. However, before entering into any 

 details, I must particularly direct attention to the meaning of the 

 words ^^ Jura''' or "Jurassic,^' as applied by Mr. Tate. On p. 168 

 {loc. cit.) the following passage is to be found. " The Jurassic 



series is reduced to beds representing the Lower and 



Middle Jurassic beds, from the Lias to the Oxford Clay inclusive," 

 &c. This plainly shows that Mr. Tate uses term the Jiwassic as in- 

 cluding the three formations known under the names of Lower, 

 Middle, and Upper Jurassic rocks, or Lias, Dogger, and Malm, or 

 Black, Brown, and White Jura, &c. 



In my memoirs, previously noticed, I have, among the Jurassic 

 rocks of the Spiti valley and the North-west Himalaya, distinguished 

 the folloAving formations : — 



1. Lias 



J a. Lower Tagling limestone. 



\h. Upper Tagling limestone. 



iy j>. { c. Jurassic slates (not specified). 



Z. IJogger .... I ^^ g^^iti g;^^lgg^ 



3. Malm (?).... e. Gieumal sandstone. 



1. Lias. 



a. The Lower Tagling limestone generally rests unconformably on 

 the Lower or Upper Triassic* limestone ; it is of a dark grey colour 

 and often has an oolitic structure. The weathered surface of the 

 rock is usually rusty brown, showing that it contains a considerable 

 admixture of sandy ingredients. 



The characteristic fossils f of this limestone are Terebratula 

 gregaria, Sss., T. pyriformis, Sss., T. punctata, Sow., Waldheimia 

 Schafhceutli, Stopp., Rhynchonella ohtusifrons, Sss., R. peclata, Bronn, 

 sp., R. fissicostata, Sss., R. Austriaca, Sss., R. variabilis, Schloth., 

 R. ringens, Her., PectenYaloniensis, Defr., Lima densicostata, Quenst., 

 Avicula incequivalvis, Sow. Besides these, I have described three 

 new species oi Belemnites (B.Budhaicus, B.hisulcatus, siRdB.Tibeticus), 

 and a large number of other new species of MoUusca, which it is not 

 necessary to mention here in particular, as they have no special 

 value in point of a comparison of our deposits with those of Europe. 

 All the above-noted species, however, are well-known Liassic fossils ; 



* I have not as yet been able to distinguish properly between the Lower and 

 Middle Triassic beds. The Hmestones which appear to represent these divisions 

 are perfectly ahke. It is, however, possible that (making use of the latest re- 

 searches of Alpine geologists) the beds with the Ceratite-like Ammonites may be 

 shown to represent the Lower, and those with the Hallstadt Arcestes and Ortho- 

 ceras the Middle Trias. As Upper Trias I have quoted the beds with Megalodon 

 triqueter and Dicerocardium. I also stated that if the name 'Rhcetic had to be 

 retained, it could possibly be applied to these beds ; but it is hardly necessary to 

 iise it for the beds with the Kossen Brachiopoda Terebratula gregaria, Rhyn- 

 chonella ohtusifrons, &c. ; for the fauna of these beds is a truly Liassic one, I 

 have discussed this point with several of my friends at home, and they mostly 

 agree as to the Liassic character of their fauna. 



t I must particularly remark that all the fossils which I quote here have 

 been collected either by my colleague, Mr. T. R. Mallet, or myself. None have 

 been accepted on foreign authority. 



