3U 



figures lihtjnchoneJla plena, or an he called it: Atri/pa pleaa. Thes8 

 fossils along with othsr species are obtained as casts of the interior of 

 t'.ie shell, Sic, and are imbedded in and composed of a coarse matrix, 

 consisting of rounded grains of quartz cemented together by a calcareous 

 mass of a light gray colour. This band has, no doubt, a much greater 

 geographical distribution than has as yet been assigned to it, for south, 

 west and north of the wharf the same measures are seen along the 

 Ottawa, on both sides of the river almost up to the Chats Falls. This 

 discovery of Mr. Sowter's is interesting and throws additional light 

 on the lower measures of the Chazy formation, any of which is most 

 A\elcome. 



At Britannia, opposite Deschenes, on the Ontario side of tin 

 Ottawa River, the club held one of its regular monthly excursions on 

 the 19th of September last. There the same formation is agiiin seen 

 to crop out between the track (C.P.R.) and the river and the lake 

 shore, as also south of the track, between it and the Richmond Road. 

 A numbar of sections were taken, and the calcareous nature of many 

 strata noted, but little was found in the way of fossils uatil late in 

 the day. 



From the tliia l)9dded renaceous be Is of the Chazy formation 

 here (lower series) we ai-e pleased to record the discovery of beautitul 

 scolithoid markings.' It was Mis? Wyndham who liad the honour of 

 discovering the same, and in great abundance, in. a held a few hundred 

 yards to the south west of t!ie present station or railway crossing. 

 The question arose as to whether or not the presence of this Scolithus 

 did not indicate that these rocks were of the Potsdam formation. 

 Against tliis view was the fact, brought up by one of the leaders, that 

 similar markings of annelids (?) do'.ibtfully referable to S. Canadensis, 

 Billings, but diflicult to differentiate, hail been found by him in ex- 

 posures of the Chazy at Hog's Back, Nepean, between the zone of 

 Lingula Belli and the " Leperditia band " higher up in tlie section. 

 Then the fact that there is no evidence whatever of a fault or dislocation 

 occurring here between Britannia and Deschenes, coupled with the 

 horizontality of the measures throughout, makes it clear that the 

 Chazy of De.schenes occurs also at Diitannia Thus, from the pal^on- 

 tologic as well as from the statigraphic argument the evidence is entirely 

 for the (l|:azv forinntion. 



