Volcanic Necks at Andersons Inlet. 161 



olivine crystals from this rock, or picked them up us fragments 

 during movement in the neck. 



Included Pebbles. 



The special feature of interest in this agglomerate is, however, 

 the presence of numerous small and medium-sized pebbles and 

 fragments of pebbles. These occur in some places in considerable 

 numbers, and may be seen either lying loose on the surface of the 

 disintegrated material, or embedded in the matrix. The pebbles 

 range from the size of mere gravel to that of a goose's egg. In. 

 fact, one large pebble of quartzite was found on the mud-covered 

 surface east of the jetty, but within the boundary of the neck. 

 This pebble weighs several pounds, and is 8 inches long by Sc- 

 inches broad and 3| inches thick. Judging by its appearance 

 when found, and its location, it had apparently been disintegrated 

 from the subjacent material. These pebbles occur chiefly to- 

 wards the southern end of the neck, west of the jetty, but they 

 probably also occur between here and the foot of the cliff. Drift 

 and blown sand, however, covei'ed with tea-tree, hide the 

 surface of the neck from sight. A few pebbles are also obtain- 

 able from the soil in the cliffs. 



Comparatively few of them occur entire. Most of them have 

 been transversely fractured, or have lost chips. Their general 

 shape is a flattened oval ; some are cylindrical ; others rounded 

 and flattened, oval truncated, flat, quadrangular and semi-rounded 

 and irregularly shaped with flattened sides. A few show rude 

 facetting. They comprise the following rocks, as well as can be 

 determined roughly, viz : olive mudstone ; red, brown, yellow, 

 dark black, blue and reddish-brown plain and banded jaspers, 

 odd ones showing thin streaks of white silica ; greenish-grey and 

 bluish-grey slightly pitted rocks like hornstone ; yellowish-white 

 quartz schist ; fine to coarse yellowish-white, bluish-grey, brownish- 

 grey and white sandstones, some with thin quartz veins ; white, 

 yellow and rose quartz of various kinds, transparent and 

 opaque, semi-opaline, chalcedonic, and opaque-white, with thin 

 transparent veins of silica ; plain and banded quartzites of grey, 

 brown, bluish-grey, black, and reddish-grey colours, and a blue 

 variety showing a network of white veins ; altered quartz — 



