REPORT OF THE STATE PALEONTOLOGIST 1902 



1145 



is 15 feet and at Rondout 10 feet. It can also be seen at East 

 Kingston, where it has a thickness of 10 feet. This bed can also 

 be observed at Glasco and West Cainp, at both of which it under- 

 lies the Cobleskill. 



Below the Salina waterlime, or " dark cement," is found the 

 " Coralline " of Hall and other authors. This limestone con- 

 tains a fauna which is a mixture of Niagara and Cobleskill forms, 

 and is indicative of the Salina age of this limestone. Over a 

 portion of Ulster county this " Coralline " limestone occupies a 

 position between what is usually considered the Clinton forma- 

 tion 1 and the Salina waterlime. In this sense this " Coralline * 

 limestone has the stratigraphic position of the Niagara, but, as 

 the waterlime, in age, appears to represent only the upper portion 

 of the Salina and is transitional from the limestone below, it ap- 

 pears best to consider this " Coralline " of Salina age. In this 

 paper this limestone is designated as the Wilbur limestone, since 

 it was near Wilbur in Ulster county that Mather 2 in 1843 gave us 

 the following interesting section, of which the basal member is 

 the Wilbur limestone. 



Feet 



1 Fossiliferous limestone like the " middle limestone of 



Becraft's mountain " 60 



2 Fossiliferous limestone, different from the above and 



containing hornstone 50 



3 Compact dark gray limestone ( contains encrinal spines 



and Pentamerus) 34 



4 Clouded striped limestone 20 



5 Cement rock (gray) 2 



6 Compact black limestone 1 



7 Cement rock (gray), four strata 12 



8 Black " coralline " limestone (various Radiaria ; Cyatho- 



phylla, Catenipora, etc.) [=Cobleskill limestone] ... 8 



9 Cement rock (gray to black) [= Salina waterlime] .... 8 

 10 Limestone, dark colored, impure and fossiliferous 



[= Wilbur limestone] 8 



Thickness of limestones and cements 203 



11 Hudson slates and grits, thickness unknown 



1 Though in eastern New York the terms Clinton and Medina have been re- 

 tained, it is becoming increasingly evident that they are of Salina age. 



2 Geol. N. Y. 1st Dist, 1843. p. 331. 



