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Palynologic data from Aquitaine (SW France) Middle Miocene Sables Fauves Formation. Climatic evolution
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Climatic reconstructions based on palynological data from Aquitaine outcrops emphasize an important degradation phase
during the Lower Serravallian. Climatic and environmental changes can be related to sea-level variations (Bur 5 / Lan 1, Lan 2 /
Ser 1 and Ser 2 cycles). Transgressive phases feature warmer conditions and more open environments whereas regressive phases
are marked by a cooler climate and an extent of the forest cover. From Langhian to Middle Serravallian, a general cooling is highlighted, with disappearance of most megathermic taxa and a transition from warm and dry climate to warm-temperate and much more humid conditions. Conclusions are consistent with studies on bordering areas and place the major degradation phase around 14 My.
The palynologic data allow filling a gap in the climatic evolution of Southern France, as a connection between Lower and Upper Miocene, both well recorded. These results document, on Western Europe scale, latitudinal climatic gradient across
Northern hemisphere while featuring a transition between Mediterranean area and northeastern Atlantic frontage.
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Palynology Paleoclimate Langhian Serravallian Miocene Aquitaine SW France