One of the strengths of the Field Museum's invertebrate fossil collection is its Mazon Creek invertebrate collection. Totaling over 40,000 specimens it is one of the most comprehensive collections in the world of this unique fossil fauna.
 Echiura |  Problematica |  Mollusca - Bivalvia |
 Annelida - Polychaeta |  Arthropoda - Myriapoda |  Nematoda |
 Onychophora |  Arthropoda - Insecta |  Arthropoda - Euthycarcinoidea |
