Mazon Creek Fossil Fauna
Arthropods
Horseshoe Crabs
Euproops danae - Meek and Worthen, 1865
Euproops danae, showing full telson (tail) - D.Dolak collection (positive and negative halves)
Two Euproops danae specimens, Chicago Academy of Sciences collection
Pit 2, Wilmington, IL - M.Angkuw collection
Above and below: four specimens of Euproops danae, opened by natural freezing / thawing and
tumbled in the Mazon River, Morris, IL - P.Anderson collection
tumbled in the Mazon River, Morris, IL - P.Anderson collection
Euproops danae, prosoma (head shield), Pit 2, Wilmington, Illinois - A.Young collection
Pit 2, Wilmington, IL - A.Young collection
Pit 2, Wilmington, Illinois - A.Young collection
Mazon River, Morris, IL - R.Holm collection
This concretion was naturally opened by seasonal freezing and thawing, then tumbled slightly by the river current.
This concretion was naturally opened by seasonal freezing and thawing, then tumbled slightly by the river current.
Euproops danae, unprepped state (left) and fully prepared result (right), Mazon River, Morris, IL - Connor Puritz collection
Above and below: Euproops danae, two very small examples, Pit 2, Wilmington, IL - A.Young collection
Paleolimulus signatus - Beecher, 1904
Paleolimulus signatus, Pit 11, Braidwood, Illinois, Figure 39.4 The Mazon Creek Fossil Fauna 2012 - A.Young collection.
Paleolimulus signatus, Field Museum collection (T.Testa)
Paleolimulus signatus, Milwaukee Public Museum collection P359244
Paleolimulus signatus, MPM P25924.1 and P25924.2 (positive and negative halves).
Liomesaspis laevis - Raymond, 1944
Liomesaspis laevis, Mazon River, Morris, Illinois - M.Angkuw collection
Pringlia bispinosa - Raymond 1944
Above and below: Pringlia bispinosa, or possibly a larval form of another species, Mazon River, Morris, IL - A.Young collection