Summary

E. H. Davis Ancient Monuments of the Mississippi Valley

Within these mounds we must look for the only authentic remains of their builders. They are the principal depositories of ancient art; they cover the bones of the distinguished dead of remote ages; and hide from the profane gaze of invading races the altars of the ancient people.
A simple heap of earth or stones seems to have been the first monument which suggested itself to man; the pyramid, the arch, and the obelisk are evidences of a more advanced state.
Source: Gutenberg

E. H. Davis Ancient Monuments of the Mississippi Valley

The Miami itself, with its precipitous bank of two hundred feet, defends the western side. The ravines are occupied by small streams. Quite around this peninsula, on the very verge of the ravines, has been raised an embankment of unusual height and perfection. Meandering around the spurs, and re-entering to pass the heads of the gullies, it is so winding in its course that it required one hundred and ninety-six stations to complete its survey.
Source: Gutenberg

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