This paper reports on the activity of the Sub-Commission on European Quaternary Stratigraphy (SEQS) during the last inter-congress period, mainly on the meetings held in Berlin (GDR), 20—25 June 1977 and Poland, 4—11 Sept. 1979. The meeting in the GDR was organized by the "Zentrales Geologisches Institut" in Berlin. After the final discussion it was agreed to establish a resolution on the stratotype locality of the Elster Formation which reads as follows:
"On basis of the evidence submitted by A. Cepek et al., the Voigtstedt area was chosen as type locality for the Elster Formation during the field excursion of the SEQS in June 1977.
The Elster Formation follows on the deposits of the Voigtstedt interglacial and is terminated by the overlying Holstein interglacial deposits. The Elster Formation at the type locality is composed of the following members in upward succession: the subarctic part of the "Lehmzone" (limnic), fluviatile sands and gravels, glacio-limnic varved clays, till and glaciofluviatile sands and gravels (A. Steinmüller, 1977). The Voigtstedt interglacial is represented by the lowermost part of the „Lehmzone" as defined by the pollenzone (K. Erd, 1965) and also includes warm faunas of molluscs, ostracods and vertebrates (H. D. Kahlke et al., 1965). The mammalian fauna represents the youngest part of the Mammalian stage of the Biharian. The Voigtstedt interglacial lies in the Brunhes magnetic epoch (F. Wiegank, 1973). The Holstein interglacial has been proved palynologically to overlie till and glaciofluviatile deposits of the Elster Formation in the boring Sangerhausen VII. The Sub-Commission recommends further studies in the Voigtstedt area as well as in other areas (parastratotypes), for possible further subdivision of the Elster Formation." The „Vistulian Stratigraphy" Symposium was held as a work meeting of the SEQS, together with the "Peribaltic Group for Research on the Stratigraphy and Chronology of Weichselian (Vistulian) Deposits in the South Baltic Area." The Symposium was organized by the Polish Quaternary Committee in cooperation with numerous institutions and persons. After 3 meetings of the Commission the following final resolution was passed. "On the basis of the evidence submitted during the field excursion and from the papers read in September 1979 at the Symposium on Vistulian Stratigraphy in Poland, the lower Vistula area was proposed as type region for the Weichsel (Wisla) = Vistulian Formation. The Weichsel (Wisla) = Vistulian Formation overlies the marine and limnic Eemian Formation and is terminated by overlying Holocene deposits. The Vistulian/Holocene boundary needs to be precisely defined in cooperation with the INQUA Subcommission on the Pleistocene/FIolocene boundary. The Weichsel (Wisla) = Vistulan Formation in the type region is composed of the following parts: a) 3 (—5 ?) till beds b) glaciofluviatile sands, glaciolacustrine silts and varved clays, which occur between the till beds. The Sub-Commission recommends further studies in the type region and in other regions (parastratotypes) for possible further subdivision and correlation of the Weichsel (Wisla) = Vistulian Formation as well as for the establishment of the Eemian/Vistulian boundary". Additionally, R. West proposed "that the definition of the lower boundary of the Weichselian/ Vistulian stage proposed by Andersen et al. (1960) and Zagwijn (1961) be adopted for the time being; meanwhile, countries covered by the Weichsel glaciation should be asked to draw up bio-stratigraphical and lithostratigraphical tables for the Weichselian/Vistulian of their own areas, with the aim of providing SEQS with information on which to base an improved definition of the Weichselian/Vistulian stages".