﻿77 General Resume 27 



favorable for engendering a diversified fauna than others. 

 A fauna, so engendered, subsequently to become the Coeymans, 

 invaded the Oriskany Falls — Howe's Cave portion of the region 

 under consideration (see PI. 1.) Farther east and west the older, 

 Manlius type of life held on, and oftentimes luxuriated in a 

 most unprecedented manner. 



8. In the Helderberg region Tentaculites are rare above the 

 lower 25 ft. of the Manlius. They appear in great force in layers 

 as far west as Howe's Cave. Though rare, they may be ex- 

 pected in any Manlius horizon farther west. 



9. Near the base of the fossiliferous zone under consider- 

 ation, there is often a bed replete with gasteropods. The same 

 is true of the Stromatopora layers, not far below the Coeymans. 



10. Incidentally we have indicated : (a) the westernmost ex- 

 tension of the Helderberg beds ; (b) their rate of thickening 

 eastward ; (c) their exact thickness at Countryman Hill J 

 (d) the great extent of exposures north of Manlius, down almost 

 to the red Salina beds; and (e) the true stratigraphy of the gyp- 

 sum and over- and under-lying limestones about Union Springs. 



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