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Sagawau Canyon Nature Preserve Interreef Outcrops

Image of Sagawau Canyon at the Cook County Forest Preserve taken in summer of 2014 by Eric Ma. Rock wall shows thin bedded Silurian dolomite typical of inter reef deposits.
Image of Sagawau Canyon at the Cook County Forest Preserve taken in summer of 2014 by Eric Ma. Rock wall shows thin bedded Silurian dolomite typical of inter reef deposits.

In southwest Cook County near Lemont, Sagawau Canyon exposes Silurian Racine Formation dolomite in Cook County's only natural canyon. The thin bedded dolomite was deposited between reefs and a level bottom marine community dwelled here including crinoids and corals, while cephalopods jetted through tthe waters above.

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  • North America, U.S.A., Illinois, Cook, Virtural Silurian Reef - Sagawau Canyon Nature Preserve southwest Cook County near Lemont: Sagawau Canyon Nature Preserve southwest Cook County near Lemont