Malacological investigations of Butėnai (Holsteinian, Likhvian, Mazovian, Aleksandrian) Interglacial deposits in the reference section of Neravai describe stagnophilic mollusc fauna most probably related to oxbow lakes separated from the river channel. Faunas of such type are generally difficult to diagnose stratigraphically. However, findings of the rare Siberian immigrant Valvata sibirica Middendorf in the Butėnai fauna can be used as a basis for comparison and stratigraphic correlations of the fauna under discussion with other Butėnai faunas in Lithuania and adjacent regions. The Neravai tree and herbaceous flora is among the richest ones in Butėnai deposits in Lithuania. The paper deals with main representatives of this flora (Caulinia goretskyi, Azolla interglacialia, Carex paucifloroides) and their role in stratigraphic identification of Butėnai deposits. The new matter was detected to contain extinct species of Potamogeton panormitanoides Dorof. and rare remains of other species of this genus, probably another extinct species – P. pseudorutilus Dorof. Studies of each layer of flora-bearing deposits present a reconstruction of the development of interglacial communities of an ancient water body.

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2011 - Vol.53
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