Description
Kimberella quadrata
Ediacaran
Late Precambrian (Vendian)
Penega Formation
East Angelsk, white sea, Russia
Large 1 inch CAST of this example of the earliest known mollusc.
Kimberella is a genus of early, bilaterally-symmetrical animal originally described from the Ediacara Hills, southern Australia as a jellyfish, then later reinterpreted as a box jelly. Since then, numerous well-preserved specimens from the White Sea, northern Russia have led researchers to conclude that it is more closely-related to molluscs (something like a primitive slug).
Specimens are almost never on the market, and when they are, they are expensive. You might as well get a nice cast like this one instead.
Casts are affordable visual aids to fossil collectors, museum curators, and science teachers. They are life-size copies of actual fossils which fit well with fossil displays of all kinds.