30130 - Top Rare 0.56 Inch Archegonus nitidus Carboniferous Trilobite - Germany Xiphosurids Nicely collection of 2 Halisarus

Nicely collection of 2 Halisarus walkeri teeth and 1 Eremiasaurus heterodontus tooth

Impressive and unique natural association that is composed of the pubis (pelvic bone) next to a complete vertebra

Classification: Carbonaceous chondrite (CM2)

In the alteration zone (Figure 5B) the close relation between calcite and barite is observed

Layer upon layer of silica built up within the pocket

30130 - Top Rare 0.56 Inch Archegonus nitidus Carboniferous Trilobite - Germany Xiphosurids Nicely collection of 2 HalisarusArchegonus, Burmeister 1843 (trilobite) Trilobita Proetida Proetidae PaleoDB taxon number: 21075 Parent taxon: Proetidae according to P. A. Jell and J. M. Adrain 2003 See also Raymond 1916 and Sepkoski 2002 Sister taxa: Aayemenaytcheia, Ameropiltonia, Analocaspis, Australokaskia, Basidechenella, Belgibole, Benesovella, Bohemiproetus, Bollandia, Breviphillipsia, Carbonocoryphe, Carbonoproetus, Chaunoproetus, Chlupacula, Chuanqianoproetus, Comptonaspis,