Formation: Chouteau Formation, Saline County, Missouri.
Age: Carboniferous, Mississippian.
Size: 1.4 cms.
The Carboniferous trilobites were the last in populate the Earth, this Breviphillipsia sampsoni is complete and has very good state of conservation. The matrix measures 6 x 4 cm, the size of the trilobite is the usual for the specie.