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The dense, colorful banded iron formation (BIF) rocks only found low on the peninsula, but still well above the current river level, must have been dropped here megayears ago from a formation that I think is now completely eroded away. It doesn't appear that these rocks did, or still do, weather down from Bradley Peak outcrops a few miles to the west.
D2_BandedIronInSitu.jpg (432 Kb) (under photos/24/0813-17_SeminoeSugarloafLaramie/0814_HikeAndKayakSeminoe/)
By Alan Silverstein, ajs@frii.com (page updated Mon May 4 17:54:04 MDT 2026)