The American journal of science and arts . stals of iron pyrites, which for a time ledto the opinion that gold was also present in the formation. The application of thenicest chemical tests however, fails to detect its existence. I#2 Geology of Upper Illinois. the Little Vermilion. We observe, however, that the upper lime-stone strata at the former place are less fine and crystalline intheir texture; but possess, on the contrary, a tendency to rapiddisintegration, separating into ovoidal or lenticular masses, fromtwo to six inches in diameter. The lower bed is more compactin structure, althoug
The American journal of science and arts . stals of iron pyrites, which for a time ledto the opinion that gold was also present in the formation. The application of thenicest chemical tests however, fails to detect its existence. I#2 Geology of Upper Illinois. the Little Vermilion. We observe, however, that the upper lime-stone strata at the former place are less fine and crystalline intheir texture; but possess, on the contrary, a tendency to rapiddisintegration, separating into ovoidal or lenticular masses, fromtwo to six inches in diameter. The lower bed is more compactin structure, although it still contains frequent rifts and fissures. A partial digging has been made into the bituminous shale andcoal-seam of Rockwell, which fully proves the correspondencebetween them and those above described. The shale however,at this spot, afforded distinct impressions of a minute Patella,and a perfectly flat valve, (Fig. 7.) with very delicate and almostobsolete concentric strise, apparently appertaining to a species ofPlacuna. Fig.
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