. "1333"^^ . . . . . . . "43133679"^^ . . "The St. Laurent Formation is a geologic formation in Illinois. It preserves fossils dating back to the Devonian period."@en . . . . . . . "The St. Laurent Formation is a geologic formation in Illinois. It preserves fossils dating back to the Devonian period."@en . "St. Laurent Formation"@en . . . . . . . . "1096256639"^^ . . . . . . . "St. Laurent Formation"@en . . . . .