| The crinoid became the
state's official fossil on June 16, 1989, after a group of Lee's
Summit school students worked through the legislative process
to promote it as a state symbol. The crinoid (Delocrinus missouriensis)
is a mineralization of an animal which, because of its plant-like
appearance, was called the "sea-lily." Related to the starfish,
the crinoid which covered Missouri lived in the ocean more than
250 million years ago.