[MATTHEW | CLIMATIC ZONES IN DEVONIAN TIME 151 
L. aculeatum Sternb. 
Stigmaria ficoides, Brong 
S. stellata Gôpp. 
The resemblance of this flora to that of the Lower Carboniferous 
flora in Pennsylvania and elsewhere does not necessarily mean that they 
were cotemporary, but rather that the conditions of climate and habitat 
in Upper Devonian time here were similar to those that prevailed in 
Pennsylvania and Europe in the later epoch. 
The Upper Devonian of Parrsboro and Riversdale. 
On the north side of the Basin of Minas, and at its head, there is 
an important area occupied by Upper Devonian which according to 
Mr. Fletcher consists of two groups, “Riverdale” and “Union”. The 
latter appears to correspond to the measures which in the Petitcodiac 
valley intervene between the gray sandstones (No. 3 of Bailey and Ells 
section), and the Carboniferous limestone (No. 5) and is a soft, rather 
calcareous set of shales of bright red color. 
The plant remains appear to have been taken chiefly from the 
underlying Riverdale group, of coarser texture. Mr. Robert Kidston 
to whom a set of these plants were referred for examination identified 
them with species of the St. John plant beds a series of much greater 
antiquity than the Riversdale terrane. The list is as follows: 
Asterophyllites acicularis, Dn —Calamocladus equisetiformis, Schl. 
sp. 
Sphenopteris, marginata Dn. 
S.—dilatata, L. & H. 
S.—splendens, Dn. 
S.—Harttii, Dn. 
Alethopteris discrepans, Dn. 
Aneimites valida, Dn. sp. 
Psilophyton? glabrum, Dn. 
The absence of Neuropteris and Calamites from this list, is some- 
what remarkable, but nevertheless these plants are to be compared 
with those of the Quaco basin rather than with any other grouping 
of species of Upper Devonian Age in the Maritime provinces. In 
comparing them with the Silurian plants of St. John the prevalence of 
species of deltaic habit at least is shown, but this comparison needs 
revision, owing to the much greater antiquity of the St. John species. 
