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Updated: May 5, 2025
We saw, also, walls of pentagonal columns of rock, packed closely together. Where the Pelouse enters the Snake River, are immense ledges of square blocks. When we camped there, and I lay down beneath them at night, "Swedish trappa, a stair," from the geological text-book, was always running in my mind, this black trap-rock made such great steps that led up towards the sky.
All these, which were recognised as belonging to one family, were called "trap" by Bergmann, from trappa, Swedish for a flight of steps a name since adopted very generally into the nomenclature of the science; for it was observed that many rocks of this class occurred in great tabular masses of unequal extent, so as to form a succession of terraces or steps.
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