Only a few wells have penetrated the pre-Quaternary layers in the Lithuanian and
adjacent offshore. Information on the distribution and lithological features of the pre-Quaternary units may be derived from shallow seismic profiles. In 1993–1999, joint Lithuanian–Swedish geological-geophysical expeditions have obtained new data on the geology of shallow parts of the bedrock (to 600 m deep) in the Baltic Proper. Continuous seismic reflection profiling data have revealed a very complicated reflector character in the southeastern part which is offshore Lithuania. Geological identification of the seismic units is based on comparisons with onshore geology and on available data from offshore wells. Tectonic features, glacial incisions, disturbances of seismic reflections of various origins, multiples due to shallow water make the interpretations of seismic profiles a delicate matter. The paper is focused on the geological identification of Late Palaeozoic and Mesozoic seismic units and their tectonic features.

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