Excerpt from The Geological Magazine, or Monthly Journal of Geology, Vol. 9: January December, 1892
Finally we arrive at the highest horizon of black schists, viz., those of Altkirche on the north side, met with in the tunnel at 2582, 2637, 2766 m. N., which I consider to be of Liassic age and to correspond with the Nufenen belemnite schists. These have not been seen in the southern section of the tunnel, though it is possible that they may be represented there by some geological equivalent.
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