PROCEEDINGS OF THE GEOLOGICAL SOCIETY, 



[Nov. 9, 



In the Blue MotiRtain dis- 

 trict, where the hills rise to> 

 about 7350 feet, and present a 

 most broken surface, the strata 

 are so excessively disturbed, sc 

 traversed and scmi-metamor- 

 phosed by dj-kes of syenite, 

 and mixed up with porphyritic 

 masses, that it is impossible to 

 resolve the intricacies of the 

 stratification, or to determine 

 the sequence of the beds inter 

 se, without a lengthened and 

 detailed investigation. But in 

 the parish of Clarendon it is 

 manifest that igneous rocks, 

 presenting many interesting 

 phases, but all appertaining to 

 the porphyritic type, form the 

 hase of the stratified series. On 

 such rocks the Cretaceous beds 

 are deposited, and are often 

 found raised to an angle of 

 from 40° to 50°. The lowest 

 member of the Cretaceous 

 series frequently consists of a 

 thin bed of conglomerate 

 formed of the harder materials 

 of the ]>orphyries. It is suc- 

 ceeded by massive compact 

 limestones enclosing fossils of 

 the Ilippurite family (Bar- 

 rettia monilifera, Woodw.), so 

 solidly imbedded as to prohibit 

 simple extraction. The lime- 

 stones are succeeded by marls 

 and calcareous sandstones, 

 from which most of the Hippu- 

 rites, Corals, Orbitoides, Acteo- 

 nellce, &c., have been obtained. 

 The Hippurites are the only 

 abundant organic remains. It 

 is uncertain whether these 

 strata should form a single 

 series, or be divided into an 

 inferior and superior group. 

 Their combined thickness may 

 amount to 500 or 800 feet. 

 Extensive disturbances have 

 ulmost invariably broken up 



S 



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bh 



Trout Hall. - 

 Croolced River. 



EiTer Miiilio. 



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« oo( 



St. Thomas Kiver. 

 Mount Hindmost. 



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P- 6C_S 



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the Cretaceous beds previous to the 



