218 



CLIMATE OF THE OOLITIC AND TEIASSIC PERIODS. [Ch. XI. 



observes, mineralogi 

 assemblage as might 

 Norway in lat. 60° JNT 



an 



remarl 

 times 



formation of such coast-ice, it may 



W>M . ^ AV- , v^ctst (J I 



As to the degree of cold required for 



O 7 ^ 



lifted and floated away far greater weights.* 



Another 



exam 



of a rounded block, weighing above 

 thirteen pounds, had been previously noticed in the ' chalk 



a pit near Lewes. Attached to 



Mr 



it was Spondylus lineatus, with serpulee and some bryozoa. 

 It had evidently been rolled before transportation, and before 



themselves on it. No 

 met 



mi2"ht im 



>/ 



When 



quire 



climatal 



preceded the Cretaceous, we find a very general agreement 



amon« 



The vegetation of 



latitudes in the Oolitic and Triassic eras, 

 these periods consists chiefly of cycads, conifers, ~and ferns. 

 Professor Heer remarks, that the tree which is most common 

 in the Upper Trias in Switzerland has a near affinity to a 

 living African species of Zamia,f and M. Adolphe Brongniart 

 had long before expressed his opinion that the plants of the 

 secondary periods favoured the hypothesis of a climate like 



same genera, and, to some 



chat 



of the West Indies. The 



extent, tne same species of ammonites and some other shells 

 proper to oolitic strata in Europe, occur also in formations of 

 the ' 



Cutch, lat. 22° N 



same 



age m India, as, for example, in Sinde and in 



same 



tions reach within 1U degrees of the pole, as was shown 



the 



specimens brought home 

 ;se the Rev. Samuel Haue-1 



Capt. McClintock. 



closely allied to the Ammonites concavus of the Lower Oolite 

 which was found at Prince Patrick's Island, lat. 77° 10' N. 

 In Cook's Inlet also, lat. 60° N., several ammonites of Jurassic 

 types, if not species, were obtained, and Belemnites paxillosus, 



* Geol. Quart. Joiirn., vol. xiv., 1858. 



f Heer, Urwelt der Schweiz, p. 51 



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