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Table 7

Summary of climatic and environmental variations around the Oligocene/Miocene boundary determined from the sedimentology and lacustrine faunal and vegetal associations in the Limagne basin.

Age Bio zone Facies Faunal data Floral data Environments Climatic trend
Aquitanian            MN2a      Alternation of marl and calcarenite with root traces        Caddisflies Pinaceae Lacustrine environment −shallow fresh water Dry and cold
Cyprinidae (tenches) Graminaceae
Beaver Cyperaceae
Valvata sp.. Cupressaceae
Pseudamnicola sp.      
MN2a   Miliolidae Palm tree Marshy environment −brackish water   Dry and warm  
Caddisflies Characeae
MN1 Alternation of marl, calcarenite with channels of detrital sand     Caddisflies Cyperaceae Lacustrine environment −shallow fresh water and fluvial arrivals
Wet and warm    
Cyprinidae (tenches) Cupressaceae
Valvata sp.. Euhorbiaceae
Pseudamnicola sp. Juglandaceae
MP30/MN1       Alternations of marl, calcarenite with root traces and mudcracks, lacustrine limestone    Flamingos Discrepancies of Chattian floras    Shoreline retreat Aridity event   
Hydrobia sp. Tenches thanatocoenosis
Cyprinidae (tenches) Brackish water
Chattian                 Alternation of marl, calcarenite with root traces and ostracod-rich calcarenites      Beaver Gramineae Lacustrine environment −shallow fresh water      Dry and cold     
MP30 Cyprinidae (tenches) Cyperaceae
VI Caddisflies Cupressaceae
  Pseudamnicola sp. (rare)  
  Ostracods dominant  
  Alternation of marl and calcarenite, ostracod-rich calcarenite, channels of detrital sandstone locally          Cyprinidae (tenches) Chenopodiaceae Lacustrine environment −shallow fresh water          Wet and warm         
  Caddisflies Ericaceae
  Pseudamnicola sp. (rare) Ulmaceae
MP29 Ostracods dominant Juglandaceae
V   Fagaceae

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