Over twenty years ago, in 1882, I ventured to controvert a doctrine which was at the time maintained with remarkable unanimity by all geologists, and which was taught in all the current textbooks. It was that the ordinary ripple-mark of the seashore was formed by continuous water-currents of some kind; the current of water taking the place and performing the office of the current of wind which ripples the surface of sand-dunes.
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