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The unincorporated community of Lost City is home to an outcrop of the middle Devonian Mahantango Formation where fossils can be collected. Notable local fossils include bivalves, brachiopods, the bryozoan Fenestella, corals, calices of the crinoid Arthroacantha, the gastropod Platyceras, the large straight-shelled nautiloid Spyroceras, and trilobites. Some of the local Phacops trilobites have been turned to fool's gold. Many of the local fossils are covered in little glittery crystals.