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Updated: May 28, 2025
We traded for cherts as far south as Little River in the Tenasas Mountains, and north to the Sky-Blue Water for copper which was melted out of rocks, and there were workings at Flint Ridge that were older than the great mound at Cahokia." "Oh," cried both the children at once, "Mound-Builders!" and they stared at him with interest.
For us, we could only give a hasty look at its southern volcanic cliffs; while we regretted that we could not inspect the marine strata of the eastern parts of the island, with their calcareous marls and limestones, hardened clays and cherts, and famous silicified trees, which offer important problems to the geologist, as yet not worked out.
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