170 SUBDIVISIOXS OF THE CARBONIFEROUS SYSTEM 



2. Sauropus Dawsoni, (M. S.) From rocks apparently 

 of this age which occur at East Bay near West Bay 

 and Partridge Island, two miles below Parrsboro. 



LAMELLIBRANCHIATA. 



1. Anthracomya elongata, Dawson. 



2. obtusa, Dawson. 



CRUSTACEA. 



1. Leaia tricarinata, Meek and Worthen. 



2. Carbonia, sp. 



3. Estheria Dawsoni, Jones. 



4. A.nthracopalaemon ? n. sp. 



The Riversdale formation thus carries a flora and fauna, 

 \vhich cannot be taken as one appertaining to any other system 

 than the Carboniferous, inasmuch as the types are all akin, and 

 generally conceded to be closely related, even to types in the 

 productive coal measures higher up in the system. 



I hare no hesitation to state that, in the Union and Rivers- 

 dale formations, we have obtained in Nova Scotia a fauna and 

 flora, which, while not as extensive nor as varied as that obtained 

 in the productive coal measures of the same Province, are never- 

 theless remarkably similar in their biological characteristics, 

 imbedded in a series of sediments, terrigenous in character, and 

 for the most part estuarine, carrying Carbonaceous shales and 

 sandstones, underclays and conglomerates, constituting just a 

 series of strata as that, which, having begun in Eo-Carboniferous 



~ O 



time, were interrupted by an encroachment of the Carboniferous 

 Sea (Windsor formation) in which marine conditions prevailed, 

 and limestones were deposited, holding abundance of marine 

 shells and other fossil organic remains peculiar to salt-water 

 conditions, and were followed by newer, or higher, or later strata, 

 such as are met in the " Millstone grit " and " Coal measures " of 

 the same region, of various writers, characterised also by terrig- 

 enous deposits, and enclosing a fauna and flora whose affinities 

 are remarkably akin to the forms found in the Eo-Carboniferous 



