On the right bank of the St. Francois River, in S.31; T.33, N.; R. 6. E., about 200 yards southwest of the St. Louis Granite Company's quarry, near Knob Lick, Madison County, Mo., is a little sandstone ridge, trending northwest and southeast, nearly 200 yards long, 10 yards wide, and not more than 8 to 10 feet high above the nearly level ground on either side. The country rock here is the Cambrian sandstone, which overlies the granite, as is beautifully illustrated at the quarry nearby. This little ridge is interesting on account of the peculiar form of the sandstone composing it.
Proceedings of the Iowa Academy of Sciences
©1890 Iowa Academy of Science, Inc.
"Prismatic Sandstone from Missouri,"
Proceedings of the Iowa Academy of Science, 1(Pt. 2), 36-37.
Available at: https://scholarworks.uni.edu/pias/vol1/iss2/22