30581 - Top Quality 3.25 Inch Calymenella sp Ordovician Trilobite Ktaoua Formation Orthoclase (Feldspar) Pyroxene compositional trends are similar

Pyroxene compositional trends are similar

Bulk composition (G

Beautiful specimen of this trilobite species

Angelin 1854 (trilobite)

low-ca pyroxene

30581 - Top Quality 3.25 Inch Calymenella sp Ordovician Trilobite Ktaoua Formation Orthoclase (Feldspar) Pyroxene compositional trends are similarCalymenella, Bergeron 1890 (trilobite) Trilobita Phacopida Calymenidae Ecology: nektobenthic carnivore Environments: marine, shoreface, offshore, transition zone lower shoreface, coastal , carbonate, offshore, submarine fan, marginal marine, shallow subtidal, deep subtidal shelf, offshore shelf Age range: 488. 3 to 428. 2 Ma Distribution: Silurian of United States Ordovician of Argentina, the Czech Republic, France, Morocco, Portugal, Spain, Turkey