316 Transactions. 



Hector's subdivision of the beds from Coverham to the Mead Gorge is 

 as follows : — 



Contorted sandstones {Belemnites superstes) ; volcanic dykes. 



Concretionary marls ; large Inoceramus. 



Sandstone with plants. 



Septaria clays, with Inoceramus, belemnites, and Conchothya. 



Black grit with fish-scales, ammonites, Inoceramus. 



Black marls with sandstone bands. 



Plant-sandstones with Dentalium majus, Nerita, Naiia, Inoceramus 



{=-- Amuri sands). 

 Belemnite sandstone. 



Black marls with cone-in-cone limestone bands. 

 Green sandstones. 

 Conglomerates and brown sandstones containing plants and coal. 



In attempting to establish a similarity with the Piripauan beds at 

 Amuri Bluff, Hector has given in the above succession too much promi- 

 nence to the sandstone bands and too little to the black mudstones which 

 make up about 90 per cent, of the succession. The green sandstones 

 mentioned were probably observed on the Kekerangu side of the pack- 

 track from that place to Coverham, where such beds occur. 



The Clarentian near Coverham is occasionally penetrated by intrusive 

 rocks which consist of very much weathered amygdaloidal basalts. A dyke 

 trending E. 15° S., nearly vertical but with a slight inclination to the 

 north, appears in the north-east bank of the Swale about a mile above its 

 junction with the Nidd. A similar, somewhat thicker dyke, but possibly 

 the same, outcrops a quarter of a mile farther up-stream. McKay describes 

 a dyke in the Wharf as separating the upper and lower beds — i.e., a sill. 

 It is of similar petrological character, and is either a sill or else a dyke 

 truncating the beds very obliquely. These intrusives are similar to one 

 penetrating the Amiiri limestone in the Kekerangu River, and are probably 

 to be correlated in age with the volcanic rocks overlying the Amuri lime- 

 stone in the Ure Valley and in the Herring River. 



Isolated Hill Creek, Ure Valley. — From the Chalk Range the Amuri 

 limestone swings round in a great curve to Benmore, and the underlying 

 Clarentian beds follow suit, but owing to the inaccessibility of this heavily 

 forested and deeply gorged country they have been examined only in the 

 Isolated Hill Creek, a tributary of the Ure River which cuts through 

 the limestones and flints in a gorge between Isolated Hill and the spurs 

 of Benmore. At the top of the gorge the strike of the flint-beds and 

 underlying Clarentian is east-north-east, with dip 36° to the north-north- 

 west. About 1,500 ft. of Clarentian beds are exposed, consisting of 

 dark-grey indurated mudstones or sandy mudstones, rapidly disintegrating 

 into small angular fragments on exposure. Concretions of all sizes up 

 to 7 in. diameter occur sparingly thoughout, but are rarely fossiliferous. 

 One large ammonite was obtained in a concretion from the stream-gravels, 

 but was declared by Mr. H. AVoods to be indeterminable. The beds 

 terminate downwards against a fault which has brought down the Whern- 

 side block of Amuri limestone and flint-beds against the Clarentian. 



The junction between the Clarentian beds and the overlying flint-beds 

 appears not onh' to be perfectly conformable, but to exliibit a passage 

 between the two formations. It is described in detail below. 



Upper Ure Valley. — The Notocene rocks in the upper Ure and upper 

 Swale Valleys form a great overtiirned syncline, truncated by the great 



