Lockeia James, 1879

Anistoroae, Anca & Miclăuș, Crina, 2015, The Cruziana Ichnofacies In The Lower Member Of The Bisericani Formation (Eastern Carpathians, Romania), Acta Palaeontologica Romaniae 11 (2), pp. 9-23 : 15

Ichnogenus Lockeia James, 1879

Lockeia isp.

Material: several hypichnial positive reliefs on lower surfaces of sandstone beds from the middle part of the analyzed section.

Description: Small, smooth almond-shaped oblong bodies, from 4 to 10 mm long and up to 3 mm high, tapered at one end and obtusely pointed or rounded at the other; rather scattered than oriented ( Fig. 5d ).

Remarks: When first described it was interpreted as algae, later on as “ovarian capsules” of graptolites ( Häntzschel, 1975), but now is consider to be a resting trace of a semi-sessile pelecypods ( Seilacher & Seilacher, 1994). This ichnofossil may occur in any aquatic environment where bivalves can be found (from shallow marine through brackish water to fluvial and lacustrine freshwater facies).

Figures

Fig. 5 Trace fossils: a Thalassinoides swelled at branching point; b Thalassinoides swelled at terminal part of the tube; c Thalassinoides circular section in R23 interval; d Lockeia; e, f Rhizocorallium; g Rhizocorallium with protrusive spreiten; h Avetoichnus luisae