172 The N.Z. Journal of Science and Technology. [May 
An excellent section is exposed on the south side of Jed Stream for a 
distance of 40 chains, from a point on the road along the valley half a 
mile from the shore. Here the lowest beds consist of bluish sandstones, 
occasionally current-bedded, and at least 100 ft. thick. These are followed 
by glauconitic sandstones containing thin bands of mudstone and bluish 
sandstone. These beds, which are about 50 ft. in thickness, grade upward 
into calcareous claystones, which contain lenses of limestone and calcareous 
sandstone np to 20 ft. thick. On top of this is a white earthy- 
looking limestone 30 ft. thick, and similar to Amuri limestone. This 
limestone resists weathering better than the other beds of the series to 
which it belongs, and it forms a prominent rocky ridge high on the northern 
spur of Mount Maccoinnich, a mile and a half due east of Cheviot Township. 
The bed of limestone forming this ridge may be followed northward to 
Woolshed Creek, and southward to Jed Stream, which it crosses about a 
mile south-east of Cheviot. From this point it. forms the western side of 
the valley for more than a mile. Two other small occurrences may be 
mentioned—one on the coast road about 5 chains north of the bridge across 
Buxton Creek, and the other a few chains south of the bluff between Gore 
Bay and Port Bobinson. 
These beds form part of the Weka Pass series of Haast’s report. The 
bluish-grey sandstones in the lower part of the Jed Stream section contain 
occasional and fragile fossils. Only one, a living species (Malletia australis ), 
was collected upon this occasion, but doubtless others sufficient to establish 
the age of these beds could be obtained. 
Overlying the limestone that forms the highest known rock of the 
series described above are arenaceous mudstones, which at Gore Bay are 
at least 300 ft. thick. Massive layers of these rocks, having a total thick¬ 
ness of about 150 ft., form the upper portion of the section exposed near 
the mouth of Jed Stream. Similar beds occur over a large area in the 
Cheviot district, where they apparently form the greater part of the low 
downs between Jed Stream and the railway. 
The arenaceous mudstones are bluish grey in colour, and generally con¬ 
tain a small amount of calcareous material. Thin bands of a more sandy 
nature occur throughout; and these, towards the base of the group, become 
coarser and more calcareous, and contain numerous angular and subangular 
fragments of limestone, some of which are phosphatized. The basal layer 
consists of glauconitic sandstone containing scattered subangular pebbles 
of phosphatized limestone. At the contact with the underlying rock these 
form a conglomerate layer a few inches thick. This contact was observed 
in two localities—namely, near the mouth of Jed Stream and at Port 
Bobinson. The underlying rock at both places is the limestone at the 
top of the older Tertiary beds, and the bedding-planes of one series are 
parallel to those of the other. Notwithstanding this fact, there can be 
no doubt that the underlying limestone was raised above the surface of 
the sea and more or less denuded before the deposition of the glauconitic 
sandstone. Thus the limestone contains numerous crevices which are 
filled with glauconitic sandstone, and which extend irregularly downward 
from its upper surface for a distance of about 6 ft. Irregular nests and 
streaks of glauconitic sandstone up to 2 in. thick and 2 ft. long, and parallel 
with the bedding-planes, occur in the upper 2 ft. of limestone. The upper 
6 in. is riddled with small tubular worm-borings, also filled with sand. In 
addition to these peculiarities in the limestone, the presence of water-worn 
pebbles of phosphatized limestone in the glauconitic sandstone as much 
as 4 ft. above the limestone strongly suggests unconformity. These when 
