Mo. Rev. Stat. § 10.090
10.090 State fossil.
10.090. State fossil. — The fossilized remains of Crinoidea , scientifically designated as Delocrinus Missouriensis , is declared to be the official state fossil of Missouri.
(L. 1989 H.B. 515 § 1)
Mo. Rev. Stat. § 10.090