REPORT OF THE DIRECTOR 1920-21 165 



Ottawa and Vicinity 



Dentalina sp. Nucula tenuis 



Polystomella crispa Astarte banksii 



Tethea logani A. laurentiana 



Solaster papposa Cylichna alba 



Porella elegantula Natica affinis 



Saxicava rugosa Ltmatia groenlandica 



Mytilus edulis Neptunea despecta 



Macoma groenlandica Admete viridula 



M. calcarea Haminea solitaria 



Yoldia arctica Philine lineolata 



Leda minuta Serpula vermicularis 



L. pygmaea Balanus crenatus 



From Green's creek and Besserer's wharf, Ottawa river, about 8 

 miles below Ottawa, have been reported Saxicava rugosa, 

 Macoma groenlandica, Yoldia arctica, Leda 

 pygmaea, Nucula tenuis, Solaster papposa 

 and Nereis pelagica. In addition there have been found 

 in the clay nodules at this locality remains of three species of fish: 

 a capelin, Mallotus villosus (abundant) ; a lump sucker, 

 Cyclopterus; a species of stickleback, Gasterosteus . 

 There have also been found remains of fresh- water plants, several 

 birds, mammals etc., which show that the Leda clay was not far 

 from the shore when clay with drift material was brought down 

 by the rivers. Leda (Yoldia) may occur in moderately deep water; 

 the other fossils suggest shallow water (Coleman, p. 131). 



Marine Pleistocene shells have been reported from numerous 

 localities in Canada, some of which are shown on the accompanying 

 map of localities (map 1). The two commonest and most abundant 

 shells reported are Saxicava rugosa and Macoma 

 groenlandica. Brockville, Ont., is the most southern and 

 most inland point at which Pleistocene fossils have been found. 

 At Pakenham Mills, 30 miles southwest of Ottawa, the only marine 

 shell reported is Macoma groenlandica, a species now 

 found farther up in the estuaries than most others (Dawson, 1894, 

 p. 58). The line marking the limit of known marine fossils extends 

 from Brockville through Perth, northwest to Fort Coulonge on the 

 Ottawa river. "Gravels, sands and clays not unlike the marine 

 deposits . . . occur at various places west of Brockville . . . and some 

 of them have been searched carefully for fossils, but without success, 

 suggesting that for some cause the marine fauna could not advance 

 into the Ontario basin " (Coleman, p. 134). 



