The fossilized remains of Crinoidea, scientifically designated as Delocrinus Missouriensis, is declared to be the official state fossil of Missouri.
Mo. Rev. Stat. § 10.090
State fossil
Effective: 28 Aug 1989; (L. 1989 H.B. 515 § 1)
Official source: Missouri Revisor of Statutes. Reproduced from public-domain Missouri statutes; confirm against the official source for the current text. Not legal advice.