Glassy microspherules recently reported from the late Eocene of central
Mississippi are physically and chemically similar to impact-produced
microspherules, especially those from Molino de Cobo, Spain, leading
several investigators to conclude that these samples document another
late Eocene impact event. A careful evaluation of the sample site and
spherule compositions, however, suggests that these glasses are modern
contaminants. Similar contaminants could be widespread throughout
industrialized countries.