The author described the geological features of a series of low hills and gullies about fourteen miles from Masterton, on Mr. Beetham's run; and showed a model indicating a well-defined crater, which he had no doubt was the low neck of an extinct volcano, which was in activity during the cretaceous period. He inferred from the adjacent strata, that the volcano was not ancient in a geological sense, though he offered no comparative data as to the period of its probable activity.
Dr. Hector spoke of this volcanic rock as being chiefly important in fixing accurately some of the grades in geological sequence. The discovery had also an importance in searching for gold and other minerals in the district. Although the Terawhiti District showed indirect evidence of former volcanic influences, direct evidence was afforded by large masses of hornblende, like the rock now exhibited from districts near Wellington, and the nature and origin of which they had not been able to account for until the discovery of this volcanic neck. Now they saw the reason, and there might be found other necks of old volcanic craters not far from the surface and nearer Wellington.
Mr. Beetham said this survey near Masterton had been made at his suggestion, and—though Mr. McKay might not know it—they in the district had been used to speak of this broken hill as the “crater.” Then it was covered with bush, but now that the bush was mostly burnt off, the crater shape had become more distinct. Gold had formerly been traced in rock specimens, and in the early days he had lost some money in trying to work a hole for gold quartz.