Raymond : The Chazy Formation' and its Fauna. 557 



Coscinii/m proa7'ii/i/i, TrocJioncina umhilicaiKni ? 



StictPpora sp., HyolitJivs s])., 



Ptilodiciya sp., Eoharpcs sp., 



Monticuliporoids, Isotelus cana/is,^* 



Hebertclla borealis, BatJixunis cf. B. aih^eliiii, 



Hebertclla imperator, ■ Lepcrditia canadensis. 



While it is not possible to refer any of these faunas to any one of 

 the three divisions of the Chazy recognized at Chazy and Valcour 

 Island, yet they show that all these localities are in the region of the 

 typical Chazy fauna. 



Ottawa Valley Region. Aylmer Formation. 



1. (irenville, Canada. Fifteen miles northwest of Hawkesbury. 

 The following section at Grenville is given on page 123 of the Geol- 

 ogy of Canada, 1863 : 



(i) Concretionary limestone — Calciferous. 



(2) Light to dark gray calcareous rock, with three feet of limestone 

 at the base. Thickness 10 feet. Fossils : Lepcrditia canadensis, Iso- 

 chi/ina ottazva, and Friniitia logani in great abundance, rieiiroto- 

 maria pauper, Helicotoma umbilicaia, Lophospira perangulata, Cyrto- 

 doniafaba, Orthoccras Jiisingeri and Bathyunis angelini. 



(3) Whitish sandstone interstratified with green shale, with vast 

 numbers of fucoids and black ])hosphatic concretions. Thickness 50 

 feet. Fossils : Fucoids and fragments of LingiilcE. 



(4) Somewhat arenaceous rock, with some black phosphatic nodules 

 Fossils : Lingiuc/s Caniarota-c/iia plena. 



(5) Limestone composed almost entirely of Cania?-ofa'c/iia plena. 



2. L' Original, Ontario. Across the river from Grenville. 



Malocystites niurchisoni, II hen us sp., 



Caniarofa-chia plena, Bathyurus sp. , 



Rajincsqiiina incrassata ?, Lep.erditia canadensis, 



RaphistoDia striatum, Lepcrditia aniygdalina, 



Helicotoma ? s\:t., Ostracoda. 

 Orthoccras sp., 



3. Cornwall, Ontario. South of Grenville on the St. Lawrence. 

 Camarotcecliia plena. Prim ilia logani. 



3» I'robablv Isotelus tiarrisi. 



