124 Neio Upper Silurian Fossils. 



an inch. It is associated with Cyatliopliyllum (Columnaria) 

 inequale, the (Leptozna) Strophodonta, figured without a specific 

 name in Vol. II, Pal. of N. Y., pi. 74, figs. 3a and 3b, Bhyn- 

 clioneUa lamelldta, B. nucleolata, Calymene cameYata, Stroma- 

 topora constellata, and some other species of the Coralline lime- 

 stone, along with Holy sites catenulatus, Ft. agglomeratus, Callo- 

 pora and Trematopora, species not determined, Cladopora 

 seriata, Favositcs resembling the spheroidal forms figured in 

 the same volume for the Niagara Group, Bhynchonella pisa, 

 Ambonychia acutirostra, Aulopora precius ffj, Spirorbis inorna- 

 tus, Ganinia bilateralis, Streptelasma, species not determined, 

 Froetus, and some other forms not yet identified. 



The association of some of the Niagara forms of the Ohio, 

 Wisconsin, and Illinois palaeontology with the coralline fossils 

 of Schoharie, is very interesting. The Coralline, I think, is 

 continuous from Schoharie along the Hudson to Rondout, and 

 thence southwardly along the Appalachian folds to and be- 

 yond this village. 



The forty feet of rock lying between the Coralline Lime- 

 stone and the Dark Blue Tentaculite Limestone seems to agree 

 very well with what is called the Water-lime group by some, and 

 the Salina or Onondaga Salt group by others. At the top it 

 has about ten feet of thinly laminated, much contorted, ashen- 

 colored strata, with vertical sutures and an abundance of 

 calcite in sheets, with the appearance, on the outside, of the 

 Lignilites of Prof. Eaton. The contortion of this bed is all 

 the more striking because there is none of it in the strata 

 above or below. The rest of the rocky strata between this 

 contorted slate and the Coralline Limestone may be general- 

 ized as consisting of two light-blue beds, weathering buff, 

 with an intermediate limestone. The entire series from the 

 Dark Blue to the Coralline is palseontologically connected 

 with the Tentaculite Limestone, and I like best the division 

 which makes the Water-lime an extension downward of that 

 subdivision of the Lower Helderberg group. 



This Coralline Limestone is in no way connected with or 

 related to the (" Favosite Limestone ") Stromatopora Limestone 

 of my former paper.* The species are entirely different. 



*Annals of the N. Y. Lye. Nat. Hist., 1876. Art. 27. 



