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NEW YORK STATE MUSEUM 



Amsterdam and Aiken to the first branch of the creek, where the 

 Trenton limestones are again exposed and may be traced to the 

 forks of the creek. The higher part of the city of Amsterdam is 

 mainly composed of clay, and no rock is exposed higher than 90 

 feet above the river except along Chuctanunda creek and its 

 branches. 



North Chuctanunda creek, as it is called on the Amsterdam 

 topographic sheet, has its head waters in Perth and Galway town- 

 ships and after pursuing a southwesterly course empties into the 

 Mohawk river just west of the present Amsterdam railroad station. 

 From Hagaman's mills to its mouth the stream flows over a large 

 number of low escarpments formed by the unequal erosion of the 

 limestones which compose its bed, and almost every one of these 

 waterfalls has been utilized for water power. Thus for a distance 

 of several miles the water of the little stream is handed from one 

 mill to another. Near the Sanford carpet mill the main creek 

 receives a branch from the north. This branch rises by several 

 head branches in the township of Perth and pursues an almost 

 due south course. The most eastern of these head branches receives 

 the water of the Amsterdam city supply system from the Amster- 

 dam reservoir pipe line (the reservoir itself being in Galway) at 

 a point near the Fulton-Montgomery county line, and the city 

 water thus flows together with the water of the creek into the 

 secondary reservoir just southwest of Rockton. Both branches of 

 the Chuctanunda are of considerable geologic interest. 



Near the mouth of the Chuctanunda just below the depot the 

 upper layers of the Calciferous sandrock are exposed as follows 



(45C): 



C* Shaly, fucoidal, thin bedded layers weathering ash- 

 white. This rock is in general composed of a matrix 

 of rather pure limestone, with fucoid-like fillings com- 

 posed of arenaceous material which gives the weathered 

 surface a mottled or reticulated appearance. 7'=23' 



(y Grayish blue mottled fossiliferous layer to some 

 extent resembling the compact mottled layers sometimes 

 seen in the Trenton limestone but more arenaceous. 

 Specimens of O p h i 1 e t a are fairly abundant. i'=i6' 



(y Massive, arenaceous irregularly jointed fucoidal 

 limestone weathering light gray. 11 '=15' 



