January, 1900. 
51 
Frequent reference has been made to the shaly character of 
some ot the upper layers. This character, while very apparent at 
certain points ui some of the layers, cannot be considered as general 
throughout any layer, as but a short distance from where the 
shaly character is clearly observed, the layer becomes either an- 
gular or lumpy in its breakage. Neither are there in any of the 
layers any certain lines of cleavage, for on being broken with the 
hammer, they are just as liable to break across the plane of bedding 
as with it. Even where there has been extensive weathering, and 
it apparently shows a shaly character, this feature of breakage is 
as constant. Some of the heavy layers at times have the appear- 
ance of being made up of a number of layers, which, however, on 
being traced for a short distance entirely disappear and the layer 
becomes solid and the character lost. 
The plate shown herewith is a reproduction of a photograph 
taken by Mr. Wm. Berthelett, one of the officers of the Cement 
Company. It shows a vertical face of a portion of the workings 
in the quarries on the west side of the river, and exhibits the 
first good display of joint structure that has been noted at the 
locality^ the plate unfortunatelv not having range enough to show 
the adjoining jointure, although it shows most accurately almost 
the full thickness of the formation, the lower layer being partially 
covered by water, while a portion of the upper layer has been de- 
nuded. The numbers to the left indicate the layers referred to 
in this paper. The layers vary from a few inches to about three 
feet in thickness, the most of them being heavy in their bedding 
and all of them very uniform in their thickness throughout the 
workings. For quarry purposes they are locally known as numbers 
one to fourteen, beginning at the top, but as all geological forma- 
tions are investigated from the lower layer upwards, for the pur- 
pose of this paper these local numbers are reversed, while three of 
the upper layers for palseontological reasons have been divided, 
adding three extra layers, making seventeen ; we therefore begin 
with number one at the base of the formation. 
Numbers one and two are rather heavy-bedded being each 
about 1 8 inches thick. They have a tendency towards being granu- 
lar in their structure, are not very hard, and contain but few organic 
remains, those found being in the form of impressions in rather an 
indifferent state of preservation, and none but what have been rec- 
ognized in the layers above them. 
Number three is 20 inches thick ; it is not as granular as num- 
bers one and two and is considerablv harder, it contains almost in- 
numerable specimens of the genera Stropheodonta, and a few plant 
remains, few other forms being found. The Stropheodonta are al- 
ways in the form of impressions of either the exterior or interior 
