Wall. — Helichr3'sum dimorphum Cockayne. 107 



(2.) The leafy parts strongly resemble H. filieaule, and the leafless parts 

 H. depressutn. 



(3.) The plant is of extreme rarity, and this would be accounted for, 

 in part, if H. dimorphum were a hybrid between the two plants named. 



Postscript. 



Since the above was written T have observed the plant in great 

 quantities on the Lower Poulter, on the Esk River near its confluence 

 with the Waimakariri, and along the Waimakariri itself between the con- 

 fluence of the Poulter and that of the Esk with that river. The Esk 

 mouth is not much more than five miles from the Pufier's Creek locality. 



Art. XVII. — On tJie Occurrence of Striated Boulders in a Palaeozoic 

 Breccia near Taieri Mouth, Otago, New Zealand. 



By Professor James Park, F.G.S. 



[Read before the Otago Institute, 9th December, 1919 ; received by Editor, 31st December, 



1919 ; issued separately, 10th, June 1920.1 



In a small cove close to Rocky Point, which is the first headland on the 

 south side of Taieri Mouth, and about a mile and a half from the Taieri 

 jetty, there is a conspicuous bed of coarse red and green breccia. It is 

 underlain by bluish-grey micaceous phyllites, and overlain by altered 

 flaggy greywacke. The strike of the breccia and associated rocks is about 

 N.N.E.-S.S.W., and the dip S.S.E. at angles ranging from 5° to 30°. 

 Generally the inclination. of the lowermost beds is flatter than that of the 

 uppermost beds. At Taieri Mouth the dip of the grey ' micaceous slaty 

 rocks ranges from 5° to 15°, and that of the greywacke south of Rocky 

 Point from 15° to 30°. 



The breccia is well exposed in the sea-cliffs near Rocky Point, and can 

 be traced northward along the line of strike one -third of the distance to 

 Taieri Island as a line of submerged reef that is in places awash at low 

 water. It is not present on Taieri Island. 



To the southward of Rocky Point the breccia -ought to crop out on the 

 ridge between that place and Akatore Inlet, but I failed to find it there. 

 It is a rock not easily overlooked, and I am inclined to believe that it 

 peters out before it reaches the crest of the ridge. It is probably a lens- 

 shaped mass with a maximum thickness of some 120 ft. 



At Rocky Point the breccia resembles a consolidated rock-rubble, being 

 mainly composed of a confused pile of angular and subangular fragments 

 and blocks of red and green siliceous slaty shale. It also contains numerous 

 masses of an excessively hard jasperoid and aphanitic breccia that appear 

 to have been torn from some pre-existing breccia. The constituent frag- 

 ments range in size from small grains to masses many feet in diameter. 



