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 and sand dollar, the crinoid lived in the ocean that once covered Missouri. There are about 600 species alive in the ocean today. (RSMo 10.090) Source: http://sos.mo.gov/symbols/symbols.asp?symbol=fossil Note to people who live in Kansas: Kansas does not have an official state gem, mineral, rock, or fossil. If you would like to change this, you can contact one of your representatives and get one. I suggest Niobrara Chalk, as in Rock Chalk Jayhawks.