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Abstract
Magyar, Imre, and Dana H. Geary,
DOI:10.1306/13291392M953142
2012. The American Association of Petroleum Geologists.
Biostratigraphy in a Late Neogene Caspian-Type Lacustrine Basin: Lake Pannon, Hungary
Imre Magyar,1 Dana H. Geary2
1MOL Hungarian Oil and Gas Plc, Budapest, Hungary
2Department of Geoscience, University of Wisconsin-Madison, Wisconsin, U.S.A.
ACKNOWLEDGMENTS
We thank Terry Baganz and John M. Armentrout for their useful comments on the manuscript.
ABSTRACT
The late Miocene–early Pliocene Lake Pannon was a large, long-lived, brackish lake that occupied the Pannonian Basin system in Central Europe. Traditionally, the stratigraphic subdivision of its several-kilometer-thick sediment pile has been based on fossils of endemic mollusks. For a long time, however, stratigraphers were misled by the unconventional architecture of the lacustrine-deltaic sequence. Due to progradation, the increasingly younger sediment packages have been deposited horizontally next to each other instead of forming a purely vertical succession. This pattern was fully recognized recently by seismic exploration of the basin. Newly interpreted biostratigraphy using anagenetically evolving mollusk lineages (in the littoral and sublittoral facies) and dinoflagellate algae (in the sublittoral and profundal facies) is consistent with this progradation model. The regional Lake Pannon stratigraphy is tentatively correlated with the geologic time scale through mammal stratigraphy, magnetostratigraphy, and radiometric age measurements. This correlation suggests that temporal resolution of the biozones is on the order of 1 m.y.
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