202 THE CAMBRIAN. [bvluSU 



A description is also given of a Calcareous sandstone as it occurs 

 on the west side of the Kayadarosseras Mountains. 1 The sandstone 

 referred to by Mr. Steele, and also the lower portion of the Calcareous 

 sandstone, are now known to be of Upper Cambrian age. 



Various references are made by Prof. Amos Eaton to the Calciferous 

 sandrock (or Transition sandrock) as examined by him in the valley of 

 the Mohawk. He also says : u Perhaps the Transition sandstone of the 

 Green Mountain series may not be connected with that of the Macomb 

 Mountain series." 2 Most of Prof. Eaton's references to this formation 

 are very indefinite, and he included it with the Calciferous sandrock, as 

 exposed at Little Falls in the valley of the Mohawk. That he was 

 aware of its stratigraphic position is shown by the comparisons made 

 between the Transition sandstone of the Green Mountains and that of 

 the Macomb Mountains, the latter now being known as the Adiron- 

 dacks. 



The attention of Mr. J. H. Steele was called to the oolitic formation 

 about 2 miles from the village of Saratoga Springs. He described the 

 occurrence of great quantities of calcareous concretions of a most singular 

 structure ; they are mostly hemispherical, but many of them are globular 

 and vary in size from half an inch to that of 2 feet in diameter ; they are 

 obviously composed of a series of successive layers, nearly parallel and 

 perfectly concentric, etc. 3 This is the first notice of a fossil that was 

 subsequently described by Prof. James Hall as Cryptozoon proliferum.* 

 It occurs in layers in which the Upper Cambrian or Dikelocephalus 

 fauna is found a few miles west of Saratoga Springs. 



In the first annual report of the geological survey of New York 

 Dr. Emmons mentions a sandstone resting on the primitive rocks both 

 on the Lake Champlaiu side of the Adirondack Mountains, at Whitehall, 

 and on the western side, in the vicinity of Theresa, on the Indian River. 5 

 In this preliminary paper the Calciferous sandrock of Prof. Eaton and 

 the subjacent sandstone are not clearly differentiated. In the second 

 report, however, he separated the sandstone as the u sandstone of Pots- 

 dam." 6 His description of the rock is as follows : 



1 shall not enter upon its geological relations any further than to state that in 

 Potsdam and other towns in which it appears it uniformly rests on the primary 

 strata ; and in no part of the county is there any rock which interposes itself between 

 it and the Primary, so that it appears here as the oldest representative of the transi- 

 tion series. The identification of this rock with the sandstones along the southern 

 border of Lake Ontario will be a matter of some difficulty. It is geologically below 



J Op. cit.,p. 56. 



2 A geological and agricultural survey of the district adjoining the Erie Canal, 1824, p. 78. 



3 A description of the oolitic formation lately discovered in the county of Saratoga and State of New 

 York. Am. Jour. Sci., vol. 9, 1825, p. 17. 



4 Cryptozoon, n.g., Cryptozoou proliferum, n. sp. Description of PI. VI, 36th Ann. Rep. N. Y. State 

 Mus. Nat. Hist,, 1884. 



6 Fir»t annual report of the second geological district of New York. First annual report of the 

 geological survey of New York. Albany, 1837, pp. 106, 107. 



6 Report of the geologist of the second geological district of New York. Second annual report of 

 the geological survey of New York. Albany, 1838, p. 214. 



