Note III-40 — Chapter III · ITINERARY, CONCLUDED: IN THE MOUNTAINS OF COLORADO ON HEADWATERS OF THE ARKANSAW AND RIO GRANDE, DECEMBER 1ST, 1806-FEBRUARY 26TH, 1807.
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The billows of sand which Pike has on his right as he comes down Sand cr. from Sand Hill (Music, Medano) Pass are very remarkable formations, which alone would fix his position in the lack of any other data. West of these Dunes are several streams of the San Luis system, flowing southward to form sinks called the San Luis lakes, though Pike's map runs them into the Rio Grande. His camp is on or near Sand cr., at about the point where this and Mosca cr. join, or perhaps a little further along. Mosca cr. is the one that comes down from Mosca Pass, and if Pike had made this pass he would have fetched out in the valley at about the same spot—at or near Montville.