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Sagawau Canyon Nature Preserve Interreef Outcrops

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.

Sites

  • North America, USA, Illinois, Cook, Sagawau Canyon Nature Preserve southwest Cook County near Lemont. [LL]