PHYSICAL HISTORY 



359 



The extent and importance of these interruptions in sedimentation are 

 best exhibited by the following distribution chart of horizons. The locali- 

 ties are chosen to avoid duplication, and from Rochester east they are 

 spaced at moderately equal intervals. Thin ore beds not associated with 

 significant diastrophic changes are omitted. The asterisks signify pres- 

 ence of the horizon. 



West 



w 

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 « 



a 

 o 



a 



2 



a 



a) 



3= 



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OS 



•** 



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s 



SK 



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 o 



a 



c 



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CD 

 0) 



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 as 



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2 



St 



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a 

 t3 



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 a 



> 



s 



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 a 



al 



East 



Mesont&ric 



Lockport dolomyie series (Decew. etc.) 





Gates 





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« 



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*? 



t 



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Rochester 





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Lakeport 













« 



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Donnelly 



Iroadequoit 



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ik 



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Pboefiii-Hert. 





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*7 



Sirkland 



Brewerton 









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if 



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:l 1 

 '11 



Ifilliaoson 











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» 









Wolcott Furnace 















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Wolcott 













7 



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s s 



Sodus 











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Reynales ("Wolcott" 



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It? 



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7 



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o 



Furnacerllle 







7 





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it 





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Baar Cr.-M&rtylUe 











•Mr 



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Otsquago 





Maplewood ("Sodus") 





w 





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Tborold 





9 



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*? 







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Oneida 



Medina 



Cat. 



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■H 



4fj 



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* 



JL 



-U 



? 











OrdoTician 



Queenston red sandy shales 7. ?.. 





The hour-glass pattern of this chart is even more convincing than the 

 diagrams, as to the prime import of the middle (post- Wolcott) discon- 

 formity. This break forms the natural division between lower and upper 

 Eontaric. 



Classification and Faunas 



On the basis of these unconformities, disconformities, and "diastems" 

 found in the New York strata, we may forecast some future readjustments 

 in the classification of the Eosiluric (Eontaric). The summit of the 



