IN EASTERN CANADA.—AMI. ies 
rington River, from strata now referred to the Riversdale 
formation, Sir William Dawson placed them in the Millstone 
Grit formation, so intimate are their relations to the plants of 
the Coal Measures; and from my own observations also to 
the faunas and floras which are now known to immedi- 
ately underlie the Millstone Grit of certain portions of Nova 
Scotia. 
The Riversdale formation must now, therefore, both on 
account of its position in the succession of sediments and especially 
from the life-zones it holds, be classed as an Eo-Carboniferous 
formation. This formation clearly underlies that series of 
marine limestones referable to the Windsor formation, as this 
has been described and mapped out fully by Sir Wm. Dawson, 
and more lately and with special care and accuracy by Mr. 
Hugh Fletcher. 
II].—TuHeE MARINE SEDIMENTS. 
In the districts of Nova Scotia under examination, besides 
the Eo-Carboniferous formations of Union and Rivesdale, con- 
sisting of red shales and sandstones and conglomerates, more or 
less strongly cemented together, together with the series of 
dark grey coloured, and black or greenish and rusty shales as 
defined by Mr. Hugh Fletcher, forming a great thickness of 
sediments, constitute one of the cycles of sedimentation peculiar 
to the Carboniferous System, there occur certain other strata 
overlying these unconformably, viz.: the marine limestones 
and associated gypsum, marls, shales and sandstones. 
These marine limestones, &c., hold abundance of fossil organic 
remains, as shown on the East Branch of the East River of 
Pictou at Springville; at Brooktield ; and Miller’s Lime Kiln near 
the D. A. R. Bridge, Windsor, N.8., where the series is highly 
fossiliferous and the forms are well preserved. The term, 
“Windsor Series,” is quite applicable to these strata and 
deserves to be recognized as constituting a typical formation 
or phase of the Carboniferous system in this portion of 
Eastern Canada. 
