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Half a Billion Years Ago, Trilobites Died in Strange, Orderly Lines
Half a Billion Years Ago, Trilobites Died in Strange, Orderly Lines
Trilobites: Sudden Appearance and Rapid Burial | The Institute for
Did tidal zone trilobites lead the way onto land?
Tools Never Die, The Finale : Krulwich Wonders... : NPR
When Trilobites Ruled the World - The New York Times