عصر أردوفيسي mass motality assemblage of Cincinnetina meekiCererithyris arkelli Almeras, 1970; dorsal view; Middle Jurassic (Bathonian); Ranville, Calvados, France. From the collection of Clive Champion.
Stropheodonta demissa from the Silica Shale (Middle Devonian) of Michigan.Striispirifer niagarensis (Conrad, 1843) from the Rochester Shale, Member D; Sheinwoodian (عصر سيلوري) of New York.
A Waconella wacoensisعضديات الأرجل, view of the brachial valve, 16mm along the axis, collected from the Main Street Formation, Denton County, Texas, USA, from the final stage of the Lower Cretaceous (الألبي)