A unique occurrence of Lockeia from the Yeongheung Formation (Middle Ordovician), Yeongweol, Korea

Numerous and diverse forms of Lockeia are excellently preserved in the dolomitic mudstone of the Middle Ordovician Yeongheung Formation, Yeongweol, Korea. They allow a description of L. siliquaria, L. amygdaloides, L. ichnosp. and L. triangulichnus nov. ichnosp.

L. siliquaria is a thin, seed‐like form, tapered at both ends. L. amygdaloides is a relatively plump, almond‐shaped form, tapered at one end while the other end is obtusely pointed or somewhat rounded. L. triangulichnus is a small triangular trace with three ridges from apex, resembling a pyramid, preserved in convex hypo‐relief and concave epirelief. L. ichnosp. is a pear‐shaped or irregular form. Usually, populations of Lockeia are monospecific and this occurrence is unique. Since all four ichnospecies of Lockeia are found on a single bedding plane of the Yeongheung Formation, the criteria used for ichnospecific differentiation appear valid