GUELPH FAUNA IN THE STATE OF NEW YORK I 27 



tained in the Racine limestone, has here been verified and the separation 

 carried out. 



The fauna of the Racine limestone was described and figured by R. P. 

 Whitfield in Geology of Wisconsin, 1882, v. 4. A consideration of the 

 fossil lists there given brings out some interesting facts. 



In the Lower Coral beds there occur, together with Niagaran corals, 

 Dinobolus conradi (originally described from the Le Claire and 

 Racine limestones), Trimerella grandis, Trochonema (Poleumita ? ), 

 Murchisonia hercyna (a Canadian Guelph form called billings- 

 ana by Miller, as Billings's name is preoccupied). This limestone is 70 

 feet in greatest thickness. 



None of these fossils occur in the Upper Coral beds (90 feet). 



The Racine beds (consisting of three facies, viz coral reefs, coral sand 

 and compact strata with cephalopods) contain, together with typical Niaga- 

 ran brachiopods, the following Guelph forms : 



Trimerella grandis, Whitfieldella hyale, Megalomus 

 canadensis, Straparollus solarioides, Bucania angus- 

 tata (=Trematonotus alpheus), Murchisonia macros- 

 pira, M. mylitta, Cyrtoceras brevicorne, C. arcticamera- 

 tum, Trochoceras desplainense. 



The Guelph bed is said not to differ essentially from the Racine, being 

 in general a rough, thick bedded, irregular dolomite, usually quite free from 

 impurities. The distinction between the two subdivisions is paleontologic 

 rather than physical and the introduction of the Guelph fossils was so 

 gradual that many localities show a mingling of the two faunas. The beds 

 are more regular and compact than the subjacent Racine and gastropods 

 predominate among the fossils. 



The following Canadian Guelph species appear in the list of fossils : 



Monomerella prise a, Whitfieldella hyale, Megalo- 

 mus canadensis, Holopea guelphensis, H. harmonia, 

 Loxonema boydi, M. hercyna, M. logani, M. longis- 

 pira, M. macrospira, Cyrtoceras arcticameratum. 



