584 T'ransactions.—G eology. 
western, Scalaria beds—these latter being, according to him, uncomformable 
to the Amuri limestone. Captain Hutton, on the other hand, describes the 
beds on the eastern wing as unconformable to the Amuri limestone, but 
makes no mention of the scalaria beds of Dr. Haast. These same beds in 
the Waipara section are referred by Dr. Haast to the Awatere formation, 
and by Captain Hutton to the trelissaic group of his Oamaru formation. 
None of these arrangements agreeing with the classification here adopted, 
which regards the grey marls as the higher beds of the cretaceo-tertiary 
formation, leaving for future determination the relation of the Mount Brown 
limestone. That these beds, as seen at Amuri Bluff, belong to the chalk 
group, there can be no doubt, their conformable sequence to the Amuri 
limestone, and the contained fossils alike being evidence in this direction. 
In the upper part they are unfossiliferous, but in the middle and lower 
part they contain a few bivalve shells, besides abundance of Foramenifera 
shells, which characterise the same marls in other localities. The lower 
part is also characterized by the great abundance and beauty of the fucoidal 
impressions contained therein. Downwards, they pass into a calcareous 
greensand, harder, but presenting the same composition as do the same 
beds at the Weka Pass and at the Waipara Gorge. These beds are parted 
from the Amuri limestone by a rubbly bed of calcareous greensand occurring 
as nodules in a greenstone matrix, which, according to Captain Hutton, 
contains, at the Weka Pass, rolled pebbles of Amuri limestone. 
When I examined the Weka Pass section, in 1874, I observed the 
pebble-like pieces of limestone, but doubted the evidence of their shape, as 
proving that they were water-worn. 
While yet undecided how to account for them in the position in which 
they occur, I discovered, in the upper part of Weka Creek, where it breaks 
through the limestone range and in the underlying greensands, pebbles of 
Amuri limestone in every way resembling those which occur in the higher 
greensand parting the Amuri limestone from the Weka Pass stone. I con- 
cluded, therefore, that these pebbles are of a concretionary character, as 
those in the underlying greensands could not possibly be the proceeds of 
the denudation of the Amuri limestone. 
This greensand conglomerate, though never more than two feet thick, 
generally about ten or twelve inches, is of great importance, as from it fossils 
have been obtained which have an important bearing on the view here 
taken of the general sequence. I have not obtained any fossils from this 
bed at the Waipara or in the Weka Pass section, but at Amuri Bluff it 
contains in places abundance of fossil bones, and of these there seems to be a 
considerable variety, but on account of the peculiar character of the matrix 
they are very difficult of extraction. Some of these I believe to be saurian, 
