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Abstract: Geological Observations on Upper Pliocene — Pleistocene Lake Sequence of Inner Albanids(Eastern Albania).



The Plio-Pleistocene lake sequence is present on some parts of Inner Albanids. It overlies on oldest formations of different lithologic nature and is usually near the regional tectonic boundaries. Although these deposits belong to the same ages, they are represented as particular basins on the geological map. Their lithologic columns are similar to each other and consist of two lithologic suites. The oldest deposits are represented by clay suites whose characteristics can be summarised as follows:

They set on eastern part of basins where the transgressive or tectonic relationships are observed.

They are accompained by coal seams which in some case are of economical importance. The latest ones are developed in western parts of the basins.

They contain macrofauna of fresh waters(Bivalve, Gastropods, Ostracoda, etc.) which date Upper Pliocene-Pleistocene age. Their thicknesses range from 200-600m, while maximum one is in eastern part of basin.

During the clay suites sedimentation the basins have been open eastward allowing in this way the possible connection to the Pannonian or Mesohelenic basins respectively. After that, the second phase of basin development began. It is characterised by the sandy -conglomeratic suite sedimentation(from 80 to 300m thick).But at the beginning, the displacement of sedimentary basins westwards took place. The sedimentary basin filling was realised from different directions, and gradually they were transformed as water-supply of recent rivers.

AAPG Search and Discovery Article #90937©1998 AAPG Annual Convention and Exhibition, Salt Lake City, Utah