The Bayfield group is a quartz sandstone found in Wisconsin along the Lake Superior coast.

[8] The Bayfield group is a predominantly red sandstone, though it varies through lighter colors such as pink, yellow, light brown, gray and white.

[7] In order of abundance, the Bayfield group is composed of: quartz, feldspar (both orthoclase and plagioclase), mica, iron oxide (both magnetite and limonite), chert, and ferromagnesian minerals.

Smaller constituents are 3.9% polycrystalline quartz, 2.3% opaques, 1.6% mafic volcanic clasts, 0.9% metamorphic, 0.7% sedimentary, and 0.4% plagioclase.

The heavy mineral suite of Orienta Sandstone is 78% ilmenite, 13% leucoxene, 3-4% apatite, 3% zircon, 2% garnet, and 1% tourmaline.

By the time that the quarries could recoup their losses, paler limestones had gained favor,[13] partly due to the "White City" of the Chicago World's Fair of 1893.