426 



Fossils of the Chazy Limestone. 



ARTICLE XXXIV. — Fossils of the Chazy Limestone, with de 

 scriptions of new species. By E. Billings. 



(Extracted from the Report of the Geological Survey of Canada for 



1858-59.) 



The following paper contains an enumeration of the species of 

 organic remains known to occur in the Chazy formation in Canada, 

 so far as they can be ascertained from the collections made, up to 

 the present date. The total number of species is 129, and they 

 may be distributed as follows : — 



Zoophyta 



Cystideae 



Crinoideas 



Brachiopoda 



Bryozoa, 



Lamellibranchiata 



Gasteropoda 



Heteropoda 



Cephalopoda 



Trilobites 



Entomostraca 

 Serpulites 



Species 



in Chazy 



Formation. 



Species 

 that pass 

 upward. 



6 



7 



14 



21 



4 



17 



21 



5 



15 



14 



4 



1 



129 



1 











.8 

 ? 



1 

 4 

 

 4 

 2 

 1 

 



21 



The species which pass upwards into the overlying formations 

 are Stenopora fibrosa, Lingula Huronensis, Strophomena alter- 

 nately S. incrassata, Or this disparalis, 0. perveta, 0. subcequata, 

 0. gibbosa, 0. borealis, Ctenodonta nasnta, Helicotoma umbili- 

 cata, 3furchisonia perangxdata, Maclurea Logani, 31. Magna, 

 Orthoceras midticameratum, 0. bilineatum, 0. Allwnettense, 0. 

 3Iinganense, llloznus arcturits, Asaphus platycephalus (?), Leper- 

 ditia f abilities (Conrad), var. (liana), Jones. 



The genera, with the exception of some of those of the Cysti- 

 deae and Crinoideaa, all pass upwards into the more recent forma- 

 tions. The genus Amphion has not been found in any higher 

 rocks in Canada ; but I think I have read an account somewhere 

 of its occurrence in the blue limestone of the Western States. The 

 genera of Cystidea, which thus far we find peculiar to the Chazy, 

 are 3Ialocystites and Palozocystites. Glyptocystites passes upwards 

 into the Trenton, and I have also seen fragments of what I think 

 a species of Pleurocystites in the Chazy. Of the crinoidal genera, 



