Trilobites are members of the Phylum Arthropoda, have exoskeletons and undergo molting
as they grow. The majority of trilobite fossils will therefore be fragmentary and difficult
to identify precisely. Following is a piece of limestone from the Brickyards in Lilydale
near St. Paul, Minnesota.
Identification: Trilobite (pydigium and thorax fragments) Locality: Brickyards area, Lilydale, Ramsey County, Minnesota. Formation: Platteville/Decorah