184 
The N.Z. Journal op Science and Technology. 
[May 
This section is exposed along the shore platform at the base of a wave- 
cut cliff whose inclination is almost the same as that of the bed—viz., 
30° south-eastward ; the strike is also almost parallel with the shore-line and 
the surface of the bed continues for several chains clearly exposed. Were 
this spot readily accessible some hundreds of tons could be obtained with 
little difficulty in the way of stripping ; the extreme inaccessibility of the 
locality, however, prevents even this limited amount of material being 
secured. 
Port Robinson and Gore Ray .—Good sections are to be seen on the face 
of the cliffs where limestones are exposed on the shore between the mouth 
of the Jed and the old landing at Port Robinson. They show the following 
sequence :— 
(1.) Typical Amuri limestone, the upper part bored and the borings 
filled with calcareous greensand. 
(2.) Nodular layer, 6 in. to 8 in. thick. 
(3.) Greensand, the lower part containing nodules sporadically dis¬ 
tributed up to 3 ft. above the junction. This greensand is the 
stratigraphical equivalent of the Weka Pass stone, and is most 
strikingly developed in close proximity to the old shore-line of 
the sea in which the limestones were deposited. This facies of 
the Weka Pass stone occurs near Stonyhurst, in the Motunau 
River, on the flanks of Mount Grey, and elsewhere where the 
conditions indicated obtained. 
Weka Pass and Waipara .—-Although the nodular layer is not so well 
developed in this locality, the general resemblance in features to those of 
the layer farther north enables its identity to be definitely established. 
The following gives a general account of the relations of the beds in this 
important locality 
(1.) Amuri limestone. This is as developed in the type locality, but 
it contains as well distinct bands and layers of more glauconitic 
material closely resembling the Weka Pass stone. The upper 
4 ft. are more or less bored with tubes which are now filled with 
calcareous greensand, the amount of boring increasing pro¬ 
gressively as the junction is approached, till it has resulted in 
the complete isolation of portions of the rock. This detached 
material contains a much higher percentage of phosphate than 
the general mass of the parent rock. The glauconitic matrix 
increases in importance pari passu with the decrease in the 
amount of Amuri limestone. 
(2.) Greensand layer, about 1 ft. thick when properly defined, but 
frequently passing up gradually without any pronounced break 
into the overlying limestone. This layer contains occasional 
nodules, but they are small and of no special importance as 
regards a commercial source of phosphate; but they serve to 
identify the horizon exactly. 
(3.) Weka Pass stone. This is usually decidedly glauconitic, but there 
are places where it differs little from the underlying rock, and 
the passage is so gradual that the junction cannot be definitely 
located. 
Other deposits of limestone at higher stratigraphical levels occur in 
North Canterbury, such as at White Rock in the basin of the Okuku River, 
in Weka Pass, and near Culverden ; in fact, it may be stated as a general 
