[2] It preserves fossils dating back to the upper Triassic period.

The formation consists mostly of gray to brown or red sandstone, but with some conglomerate and mudstone.

[3] The formation crops out along Palo Duro Canyon and the Canadian River and their tributaries.

[5] The lower beds at Palo Duro Canyon contain unusual cone-shaped iron concretions that likely formed in the vadose zone.

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