IRON ORES OF THE CLINTON FORMATION 21 



STRATA FEET 



Limestone (VVol'cott), with abundant Pentameriis 8 



Iron ore, fossil 22 in. 



Green shale (Sodus) compact, calcareous 10+ 



Medina shale 



Wallington, Wayne co. From the test hole put down at this 

 locality, the following condensed section lias been prepared. The 

 full details are given in the part of the present report relating to 

 the recent exploration. The section is introduced here for the pur- 

 pose of elucidating the stratigraphic relations in this region which 

 have not, heretofore, been satisfactorily explained. 



STRATA * FEET 



Limestone 10 



Dark shale, with graptolites 36 



Pentamerus limestone 14 



Shale, thin bedded, with few fossil varieties 54 



Pentamerus limestone 13 



Ore, fossil i 



Limestone i 



Ore, fossil 8 in. 



Green shale, calcareous 5 



Medina shale 2^ 



The total thickness of the Clinton shown in the hole is 135 feet, 

 an increase of 54 feet over the amount at Rochester. 



It will be observed that there are two beds of the Pentamerus 

 limestone, separated by 54 feet of shale. In the early reports this 

 duplication of the limestone was not recognized, which led to a mis- 

 interpretation of Clinton stratigraphy in the eastern half of \\'ayne 

 county. The main or lower ore horizon, indicated by the two 

 seams in the above section, occurs just below the first limestone bed, 

 a position that is constant throughout Wayne county. There is lu 

 some places a third ore seam immediately above the upper Pentam- 

 erus limestone. This is shown on Second creek, near the entrance 

 to Sodus bay, a little way east of Wallington, a locality referred to 

 by Hall as the Shaker settlement. From study of the Second creek 

 exposure Hall expressed the opinion that the limcst(^ne there wa> 

 identical with the lower Pentamerus and that the iron (>rt> l)e(l found 

 above it was the only one in that locality. It is now certain that 

 there are two ore horizons, the lower being concealed, as its hue of 



