This fossil is an Wiwaxia sp. (Walcott, 1911) which might be an extinct mollusc. It was found by Charles Walcott (1850-1927) in 1911 in B...

  This fossil is an Opabinia regalis (Walcott, 1912) which is an extinct arthropod. It was found by Charles Walcott (1850-1927) in 1912 in...

  This picture was taken in June 2023 while visiting Washington D.C.'s Smithsonian Museum of Natural History. It is the Platyceras dumos...