HISTOEIC AL INTRODU CTION 



329 



HalVs names, ISJ/S. Section. Hartnagel, 1907. This paper. 



(Rochester shale conformably overlies) 



Upper (Clinton) 



Crystalline limestone. . . 7' 



Irondequuit 

 limestone 



1 



Irondequoit 



limestone 



Limestone and shale 11' 



(and Phoenix) 



Second green 

 shale 



'Graptolite shale 6'" 



Williamson 

 shale 



Williamson 



' Purple shale with "pearly 

 layers" 18' 



Sodns (true) 



Pentamerus lime 

 stone 



-| Limestone 14') Wolcott 



) C limestone 



Reynales 



Oolitic iron ore 



J Hematite ore 1' LFurnaceville 



Furnaceville 



'Shale ^yith limestone 3'' 



r ,r»iT^»i* frvr>r»ii vlinl^^ 



-.Sodus shale 



Bear Creek 





1 Green shale 21' 



Maple\yoo(l 



(Thorold gray sandstone conformably underlies) 



The reason for the changes here made might never have appeared from 

 a study of the outcrops alone. But fortunately Hartnagel, returning to 

 the attack, conducted for the State a series of drillings for iron ore in 

 the drift-covered Clinton belt (9:10) of central New York which re- 

 vealed some totally unexpected relations. The results of this investiga- 

 tion were briefly stated in 1908 in a paper (9) by Newland and Hart- 

 nagel, of an economic nature, in which intimation was given of a fuller 

 report to come on the paleontologic and stratigraphic data secured; this 

 expected sequel, however, has not yet appeared. 



Meantime, because of the burial of Hartnagel's results in a report os- 

 tensibly economic, their revolutionary character has been generally missed, 

 as an inspection of the later papers cited will show. It is proposed, there- 

 fore, to epitomize the published information on our Clinton strata, with 

 the aid of the charts (figures 1 and 2) of the sections and well records, 

 and to make those changes in the nomenclature which have been rendered 

 necessary. 



To Newland and Hartnagel belong the chief credit for the field obser- 

 vations employed in this revision. Their careful records of the diamond- 

 drill cores for eight judiciously placed test holes, besides much other data 

 assembled by them, will always be of inestimable service to all workers. 

 An extensive series of rocks presented to the University of Rochester by 



