80 AN INTERESTING GEOLOGICAL LOCALITY. 



Dr. Horton is right in supposing this limestone continu- 

 ous to Monroe. He thinks that the geological relations 

 of the limestone at Warwick and Monroe, are rather 

 those of the calciferous, and that its whole aspect is like 

 that of the Newburgh limestone. I have reason, from 

 my own personal observations in the region, to believe 

 that he is right in these latter opinions. For example, on 

 Andrew Thompson's farm, two miles south of Salisbury 

 Mills, what appears to be a combination of this lime- 

 stone lies against the gneiss of Woodcock Hill, unless 

 there might be a belt of Potsdam quartzite between, of 

 which, on account of intervening soil, I was not able to 

 make myself certain. 



In the light of more recent experience, however, there 

 is nothing anomalous in the occurrence of iron ore 

 beds in connection with lower Helderberg limestones. 

 For instance, in the Report on Pike Co., Penn. Geol. 

 Survey, such beds are reported as having been formed 

 in fossiliferous Helderbeg limestone by decomposition 

 of overlying Oriskany beds. 



I will now give a more particular description of the 

 strata in Cold Hill and their fossils, as I made them out 

 in my short visit, during which it was impossible to 

 make any very thorough examination. 



The red sandstones and conglomerates on the east side 

 and summit had generally a strike of about N. 11° to 16° 

 E. (true) and a dip of about 75° W. with local variations. 

 I do not find any memorandum of the thickness of this 

 stratum as far as visible. Its eastern border is buried in 

 soil — and all the rocks visible in the fields and hills' to the 

 eastward are Hudson River shales. 



In the little quarry above mentioned near the top, on 

 the western side several hundred feet south of the cross- 

 road, the limestone crops out in a ledge conformable to 

 the red sandstone, though I did not find the line of junc- 

 tion. The inner (eastern) portion of this is evidently 



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