338 G. H. CHADAVICIv STRATIGRAPHY OF NEW YORK CLINTON 



Lakeport Clinton series is certain. Its extension eastward in a long row 

 of outcrops on the steep south wall of the Mohawk Valley is also beyond 

 question. The interesting thing is to see it change from a calcareous 

 fossil ore at Clinton to a siliceous oolitic ore at Steeles Creek (1:82), 

 and then into a highly ferruginous sand (see Vanhornsville sandstone 

 later). On inspection we find that the Furnaceville ore (if correctly 

 identified east of Martville) undergoes a similar change to an oolitic ore 

 in passing eastward from Eochester, and we are now prepared to assert 

 that the Yerona fossil ore is likewise converted into the oolitic or lower 

 ore bed of Clinton.^ This is indicated by the rate at which this ore has 

 been rising in the diagram from Lakeport to Verona, and is corroborated 

 by the presence throughout the underlying 35 to 40 feet of shale (1 : 84) 

 of the fossil Beyricliia lata (Vanuxem's "broad Agnostis/' 1: 83, 84) — a 

 form very characteristic of the true Sodus shale and its "pearly layers" 

 as well. Below this shale, Avith a suggestion of disconformity that did 

 not escape Vanuxem's eye (1: 83), are the sandstone quarries of Black- 

 stone and Davis, south of Utica, with their remarkable "fucoids." Some- 

 where in this mass Hall reports Pyrenomoeus cuneatus (3:87) of the 

 Bear Creek fauna, indicating the Martville age of these sandstones. The 

 red coloring in some of the upper layers (1:82) helps to place their 

 horizon in the sections farther east, and also ties them to the supposed 

 Martville of the Lakeport well (compare text-figure 4). The strata be- 

 neath become more shaly again, and it is wholly possible that they signify 

 a return of the basal or Maplewood shale of the Eochester section — a sug- 

 gestion that is heightened by their holding a similar conformable relation 

 to the Oneida sandstone and conglomerate below them as the Maplewood 

 does to the Thorold. 



Although we can thus pick out rather confidently the presence of cer- 

 tain members in these 100 feet of lower beds at Clinton, their exact dis- 

 crimination, with discovery of the fate of the Eeynales and other mem- 

 bers, awaits patient field-work. It is desirable meanwhile to have a term 

 for the whole mass from the oolitic ore to the Oneida, and the name Sau- 

 quoit is therefore employed on the chart and defined beyond. 



As to the 21 feet of strata between the two ore beds, and which are 

 open to easy study in the old workings at Clinton, the fossils will un- 

 doubtedly decide what horizons have been compressed into this small 

 span, which probably contains at least one important hiatus (see page 

 359). From the intercalations of ferriferous limestone in the 20 feet (15 



« Doctor Swartz writes : "I find it difficult to believe that the Verona iron ore is cor- 

 rectly identified with the Oolitic ore at Clinton. It seems to me not impossible that it 

 is a lower bed which corresponds in position with a heavy bed of iron ore in Maryland." 



