Ordovician mass mortality 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 (Silurian) of New York.
A Waconella wacoensislampshell, 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 (Albian)