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Paleozoic Stratigraphy of the Upper Midwest, USA
Dates are approximate, and deposition occurred at slightly different times in different areas
Ordovician
Platteville Limestone / Group (455–454 Ma)
Ancell Group (454–455 Ma)
Glenwood Shale (~455 Ma)
St. Peter Sandstone (~459–~455 Ma)
--- Major Erosional Unconformity ---

Cambrian

Potsdam Supergroup/Potsdam Sandstone Megagroup
Munising Group
Davis Formation
Franconia Formation
Ironton Sandstone
Galesville Sandstone
Eau Claire Formation
Mount Simon Sandstone
Old mine entrances in the St. Peter sandstone formation in Pacific, Missouri, where it is still actively quarried nearby.

The St. Peter Sandstone is an Ordovician formation in the Chazyan stage of the Champlainian series. This sandstone originated as a sheet of sand in clear, shallow water near the shore of a Paleozoic sea and consists of fine-to-medium-size, well-rounded quartz grains with frosted surfaces. The extent of the formation spans north-south from Minnesota to Missouri and east-west from Illinois into Nebraska and South Dakota. The type locality for the formation is St. Peter, Minnesota. In eastern Missouri the stone consists of quartz sand that is 99.44% silica.

Contents

Layer

In Minnesota, the soft St. Peter Sandstone can be observed at the bluffs of the Mississippi River valley beneath a very thin layer of Glenwood Shale, which lies below a much thicker layer of Platteville limestone.[1] Examples can be seen at the Minnehaha Falls near Minneapolis, the bluffs from downtown to Mounds Park in Saint Paul, and Minneopa Falls near Mankato.

Commercial use

St. Peter sandstone, also called Ottawa Sand in commercial applications, has a relatively uniform size and shape for each grain. It is used for the manufacture of glass, for filter and molding sand, and for abrasives. Its purity is especially important to glassmakers. It is also important as a "frac sand" in oil and gas drilling – loose sand is pumped in a liquid mix under high pressure into an well where the sand grains wedge into and hold open any fractures in the rock, enhancing the extraction of hydrocarbons. The uniform particle size also makes the sand useful for laboratory experiments.

Mining locations

St. Peter sandstone is or has been mined

The Unimin corporation is a large producer of commercial sand and operates the surface mines in many of these locations.

References

  1. ^ Mossler, J. and Benson, S., 1995, 1999, 2006, Fossil Collecting in the Twin Cities Area. Minnesota at a Glance: Minnesota Geological Survey: University of Minnesota.
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