Libby Reuter and Joshua Rowan
March 2014
Cliff Cave Road, St. Louis County, Missouri
N38.467794 W090.286933

The Tributary Cairn overlooks the Bussen Quarry where limestone is mined. You can see the Jefferson Barracks Bridge and the Mississippi River in the distance, behind the 600-acre quarry site. Limestone is a sedimentary rock composed mainly of calcium carbonate, actuall y the compressed skeletons of long-ago (approximately 500 Million years) marine animals.

Although the quarry itself is normally difficult to see, its limestone is everywhere. Historic building foundations and limestone for the Army Corps of Engineers’ 1884 levy project came from this quarry. Limestone from the Bussen Quarry is used today for road and building construction. The sand from the quarry is used to make asphalt and concrete. Your neighborhood’s roads, sidewalks, and home foundations or basements may have originated at this site.

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