472 PROCEEDINGS OF THE GEOLOGICAL SOCIETY. [Apr. 27, 
small unconformable patches in Cape Breton of Triassic age, and 
regarded them as the continuation of the Prince-Edward-Island 
series, resting on Lower Carboniferous rocks. 
In the accompanying map (fig. 1) the regular sequence is shown 
between the Upper Silurian and the Laurentian; and the entire 
series from the Lower Carboniferous, with the exception of the 
Devonian, is passed over in a journey by rail from Windsor to 
Halifax, in a distance of fourteen miles. The Devonian occurs at 
Nictau, and rests there on Upper Silurian slates*, which probably 
sweep round the Falmouth mountains, and connect with the Upper 
Silurian shown on the Map. 
III. Sequence or Formations*t. 
The Upper Silurian.—On the St. Croix river, eight miles from 
Windsor, the Lower Carboniferous grits are seen to rest on sup- 
posed Upper Silurian argillites. The grits dip N. 60° W. 5°: the 
argillites S. 70° HE. 50°. The argillites are generally very fine- 
grained, green internally, but weathering red ; they are interstratified 
with thin beds of quartzites, and have a breadth, near the railway, 
of 170 chains, their dip being tolerably uniform, and no repetitions 
visible; their thickness may approach 9000 feet. 
The argillites resemble in every particular argillites seen on the 
Tobique, in New Brunswick (fig. 6), and there associated with thin 
calcareous beds holding Favosites gothlandica. These are described 
in my Report on New Brunswick ¢. 
Towards the upper portion of the series the argillites are con- 
formably succeeded by bluish-black slates, holding cubical crystals 
of iron pyrites, and resembling roofing-slates. A similar change 
occurs on the Tobique, in New Brunswick. These bluish-black 
slates are exposed to a great extent on the Ardoise hill-range, 
Nova Scotia. 
The Lower Silurian.—A good exposure of the supposed blue- 
black Upper Silurian slates is visible at the thirteenth telegraph-post 
south of Ellerhouse station, on the Halifax and Windsor Railway, 
dipping S. 20° E.; and at the thirty-eighth telegraph-post brilliant 
micaceous schists, with black corrugated slates, dip N. 40° E., the 
intermediate space being covered with boulder-drift§. The brilliant 
micaceous schists, as well as corrugated slates, are much contorted, 
and overlie conformably the gold-bearing quartzite series. 
The micaceous schists and the corrugated black slates cannot be 
distinguished from similar schists and slates described in my New- 
* Dawson’s ‘Acadian Geology,’ 2nd edition, p. 498. 
+ In the ‘Journal of the Geological Society’ for 1862 (No. 72) there is a 
paper “On the Geology of the Gold-fields of Nova Scotia,” by Dr. Honeyman, 
with a sketch map of a part of Nova Scotia between Halifax and Windsor. 
t Page 131. 
§ In the absence of fossils the rocks in the preceding paragraphs are regarded 
as Upper Silurian, the difference between them and the strata next described 
being considerable; nevertheless, actual contact not having been seen, they may 
be a recurrence of the Lower Silurian beds on the other side of a great synclinal 
fold, and less altered than those in closer proximity to the gneiss. 
