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Geology at the British Association

Nature volume 54, pages 585587 | Download Citation

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THE President of this Section devoted his address mainly to stratigraphical geology, and we may well follow his example, and consider the papers presented to the Section in a similar order. Beginning with the oldest rocks, the first paper to claim attention is that by Sir W. Dawson, on pre-Cambrian Fossils. A valuable portion of this paper summarised our knowledge of the succession of Canadian rocks of high antiquity. He regards Matthew's Protolenus zone of New Brunswick as the equivalent of the Olenellus zone, and beneath this occurs a mass of greenish slates and conglomerates with a few doubtful fossils, such as brachiopods, ostracods, and protozoans. These Etcheminian rocks rest on the Huronian rocks, which contain worm-burrows, sponge spicules, and laminated forms comparable to Cryptozoon and Eozoon. Under these comes the Grenvillian system, or Upper Laurentian rocks, with Eozoon in the limestones, and at the base the orthoclase gneiss and hornblendic schists, which constitute the Lower Laurentian. The author exhibited a series of lantern slides showing the structure and composition of Eozoon canadense, amongst them being many very beautiful decalcified specimens, which none of those who criticised the paper attempted to explain.

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https://doi.org/10.1038/054585a0

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