A detailed measured profile was done for the lower part of the study section (Fig. 3). Well-preserved casts of cubic halite crystals were found in situ only on the lower surface of one bed of calcareous silty arenite in the lower part of the Stipinai Formation (Fig. 3) (GPS coordinates: E023°54.344′, N55°59.586′; ±3 m). The bed is about 2 cm thick. It was sampled for laboratory studies. Most of the samples with the best preserved casts were collected ex situ on the near slag heap of the Petrašiūnai Quarry (E023°54.333′, N55°59.616′; ±3 m). Halite cast morphology and their arrangement within the bed as well as accompanying sedimentary structures were determined from numerous polished slabs. A dozen of thin sections through the casts oriented perpendicular to the bedding was analysed by means of an optical microscope under the 20–200× magnifications. Petrographic analyses of rock fragments and thin sections were made also by means of the scanning electron microscope (SEM). Selected thin sections were stained with alizarin red-S and potassium ferricyanide in order to distinguish calcite from dolomite and ferroan from non-ferroan carbonate minerals. The illustrated specimens are hosted in the Institute of Geological