300 GEOLOGY OF THE THIRD DISTRICT. 



CHAPTER XI. 



Explanation of that part of the Geological Map of the State, which relates to the Third 



District. 



This report was put to press and finished before a proof of the map was obtained : it will 

 therefore correspond with what was expected, and not with that which may appear. The 

 discrepancies cannot, however, be great, as the construction of the map is very simple ; and 

 should any exist, the reader can correct them for himself, though they will be avoided by 

 the subsequent reporters. 



The whole of the northeast boimdary of the district, with the exception of the rocks of 

 Jefferson county, is of Primary rock : it is colored of a light pink. The outliers of the same 

 rock form patches, as it were, one at the uplift of the Noses, another at Little-Falls, the third 

 at Middleville, and the fourth to the north of St. Johnsville ; and are of the same color, but of a 

 darker hue, in order to contrast the more strongly vnth the surrounding masses, being but 

 mere spots. 



The Potsdam sandstone exists but in patches in the district, and is confined to the north- 

 east part of Lewis county : it is colored by burnt sienna. 



The Calciferous group is of an orange color. It forms a large portion of the surface of 

 Montgomery county, extending from about a mile or so in some parts on the south side of the 

 Mohawk, to the Primary region, or the part of a pink color. It forms two large areas on the 

 east and west side, and a middle one at the uplift of the Noses. It appears in Herkimer 

 county on East-Canada creek, extending north from the Mohawk river ; at Little-Falls also, 

 along Spruce creek ; and on West-Canada creek, extending for about three miles below Mid- 

 dleville, with some interruption, to a httle within the line of Oneida county. 



The Black-river limestone and the Trenton limestone are represented by an indigo color, 

 it being inconvenient to separate them in a map whose scale is so small. They form a band, 

 extending west from Black river into Oneida county from Jefferson county, and thence on to 

 Spruce creek ; branching at the waters of Steuben creek, and extending to the Mohawk by 

 Beaver meadow creek, and also along the valley where the villages of Stitsville and Holland- 

 patent are seated. It appears in patches on the north and south sides of Little-Falls ; at Middle- 

 ville, and Newport on West-Canada creek ; below the high falls on East-Canada creek ; south 

 of Brocket's bridge, forming a part of that unrivalled uplift ; at the lower uplift on the same 

 creek ; at the ferry on the south side of the river ; on the south side of St. Johnsville ferry ; 



