257 



15- Massive oolitic limestone, fossils very 

 rare except in basal two feet where 

 Productus is fairly common. In 

 places the limestones show the con- 

 centric structure prominently and in 

 such a manner as to suggest that it is 

 an original structure of the limestone. 

 This is the topmost bed of division C 



of the Windsor limestones 32 ft. 8 in. 



(10 m.). 

 Fauna of the Windsor Series. — The fauna of the 

 Windsor series as developed at Sydney differs consider- 

 ably from the fauna found in these limestones at Wind- 

 sor, N.S., but several of the species are identical 

 and there is no question as to the general equivalence of 

 the beds. On the other hand, many species appear which 

 have not been recorded from Windsor. These differences 

 appear to be due, in considerable measure, to the variation 

 of the fauna from point to point. The following notes 

 are the results of a preliminary study and are subject to 

 considerable revision and amplification. The propriety 

 of using some of the specific names here adopted is very 

 doubtful. For example, "Dielasma sacculus" Martin, is 

 certainly not present. But the form here so designated 

 has almost always been so referred to, and a different name 

 cannot be adopted without much discussion. 



The faunas of the three members of the Windsor series 

 differ considerably. That of the uppermost member is a 

 pure marine fauna with corals, Productus, Schuchertella, 

 Camarotcechia, Spirifer, Spiriferina, Composita, ''Dielasma 

 sacculus", several species of marine lamellibranchs and 

 gastropods, and other species. 



That of the middle member is also marine but evidently 

 developed under restricted or special conditions. Several 

 species of ostracods, Spirorbis, two or three species of small 

 aviculoid and alate lamellibranchs, a small gastropod and 

 the Foraminiferal species (?) Nodosinella priscilla Dawson, 

 comprise the whole of the fauna so far observed. 



The fauna of the lower member, as developed near 

 Point Edward Post Office, evidently existed under more 

 nearly typical marine conditions than did that of the 

 middle member but no such diversified fauna has been 

 observed as is found in the upper member. Whether this 

 is due to biotic conditions or difference in age cannot 

 as yet be stated. The lower member is marked by num- 

 erous species of Productus and by the alate lamellibranchs. 

 35063— 4A 



