Henry Rowe Schoolcraft,
Summary Narrative of an Exploratory Expedition to the Sources of the Mississippi River…
“ After entering the Mississippi, below Sandy Lake, the stream presents very much the character it has above. It was below this point that we first observed the juglans nigra in the forest. Its banks are diluvial or alluvial formations, elevated from six to ten feet. The elm, maple, and pine are common. There are some small grassy islands, with tufts of willows, and driftwood lodged. No rock strata appear. The river winds its way through vast diluvial beds, exhibiting at its rapids granitical, quartz, and trappose boulders. ”
