[3] Because it is almost entirely red in color and highly tilted, it is considered separate from the Bayfield Group.

[1] The Oronto Group is divided into the Copper Harbor Conglomerate, Freda Sandstone, and Nonesuch Shale.

It is typically red, with bands, streaks, and spots of greenish-white no more than a few inches thick.

[8] The Oronto Group has a higher proportion of undecomposed minerals, feldspars, micas, ferromagnesian compounds, magnetite and calcium carbonate than the Bayfield Group.

This article about a specific stratigraphic formation in the United States is a stub.