The base of the Anisian stage (also the base of the Middle Triassic series and the top of the Olenekian) is sometimes laid at the first appearance of Chiosella timorensis in the stratigraphic record.[1]
Notes and References
The elusive origin of Chiosella timorensis (Conodont Triassic). N Goudemand, MJ Orchard, H Bucher and J Jenks, Geobios, Volume 45, Issue 2, March–April 2012, Pages 199–207,
