Annual report . ere a cliff about 35 feet high cuts across the strike of the rocks,so that the contact of the conglomerate and the Grenville limestone is well latter contains at this point about fifty per cent, of a medium-grained, granularquartz or quartzite. The pebbles in the conglomerate are similar to this quartzosefacies, and it is, therefore, believed that they have resulted from its disintegration. The * This conglomerate was briefly described by Dr. i: \v EllsVol. XIV. 1901, p. 17 .1. : Geol. Sin-., Canada, 1Q13 The Pre=Cambrian (Jeology of Southeastern Ontario 70 presence
Annual report . ere a cliff about 35 feet high cuts across the strike of the rocks,so that the contact of the conglomerate and the Grenville limestone is well latter contains at this point about fifty per cent, of a medium-grained, granularquartz or quartzite. The pebbles in the conglomerate are similar to this quartzosefacies, and it is, therefore, believed that they have resulted from its disintegration. The * This conglomerate was briefly described by Dr. i: \v EllsVol. XIV. 1901, p. 17 .1. : Geol. Sin-., Canada, 1Q13 The Pre=Cambrian (Jeology of Southeastern Ontario 70 presence of a few limestone pebbles in the conglomerate is additional evidence of an un-conformity between the two series. If the conglomerate be followed from this point to the southwest for about half a mile,the pebbles will be found to gradually decrease in number until the rock becomes amica-schist. Similarly, at the northeast end of the belt, the conglomerate facies passesinto various schistose and gneissoid Fljr. 30. Hastings conglomerate. Palmerston township, near the village of Ompah. Krontenaccounty The part of the cliff shown in the photograph is about 15 feet high. In some places a mica-schist or gneiss occurs at the contact of the Grenville lime-stone and the conglomerate. Here the structure has the appearance of a conformablerelationship, if the unconformity above described were not taken into consideration. The conglomerate contains pebbles of dark-colored gneiss, and, more rarely, ofgranite. The presence of these pebbles is evidence of an unconformity between theconglomerate, on the one hand, and granite and dark-colored gneiss on the other. 80 Bureau of Mines No. 4 THE LAURENTIAN AND GRENVILLE SERIES Much of the area shown on the accompanying sketch map is unetched, indicatingthat the rocks have not been subdivided, but, as already pointed out, it is believed thatthey are largely of Laurentian and Grenville age, since pebbles of granite, limestone anddark-colore
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectminesandmineralresou
