Lewis: September 20, 1804
While traveling along the larboard shore at the start of the Big Bend of the Missouri River, Lewis examined a cliff of black, porous rock that initially looked like lava. On closer inspection, he concluded it was calcareous, resembling an imperfect form of French burrstone. He collected a specimen, noting its varied coloration of brownish white, black, and yellowish brown. The brief entry focuses entirely on this geological observation, with no mention of weather, companions, or other expedition activities for the day.
Septr. 20th on the lard. shore at the commencement of the big bend
observed a clift of black porus rock which resembled Lava tho on a closer
examination I believe it to be calcarious and an imperfect species of the
French burrpreserved a specemine, it is a brownish white, or black
or yellowish brown-
Read this entry in modern English AI-translated
September 20th. On the larboard shore at the commencement of the Big Bend, I observed a cliff of black porous rock which resembled lava, though on a closer examination I believe it to be calcareous and an imperfect species of the French burr. I preserved a specimen; it is a brownish white, or black, or yellowish brown.
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