Souvenir postcard (1986, photo by Chip Clark) from the National Museum of Natural History, Smithsonian Institution, Washington, D.C., showing two specimens of the trilobite Olenoides serratus from the Middle Cambrian period.
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Postcard (1986, photo by Chip Clark) from the National Museum of Natural History showing the trilobite Olenellus vermontanus from the Cambrian period.
Mid-Silurian trilobite Calymene blumenbachi from the Wenlock Limestone at Wren’s Nest, Dudley, UK.
