The Middle Late Miocene Floras – A Window into the Regional Vegetation Surrounding a Large Caldera

Part of the Topics in Geobiology book series (TGBI, volume 35)


Terrestrial fossils from Late Miocene sediments in the Mókollsdalur area are mainly known for their insect fauna. Plant fossils and the sedimentological context suggest that most of the macrofossils deposited at Mókollsdalur originate from trees and shrubs that grew on the slopes around a caldera lake in the highlands. Abundant fossils of aquatic crustaceans, insects, and plants suggest that the lake and adjacent areas were a diverse ecosystem at the time of deposition. Forests covering the slopes were dominated by Fagus with a few evergreen elements in the understorey (Ilex, Rhododendron). In contrast, the palynological record points to the presence of mixed oak forests in areas behind the mountain ridge surrounding the caldera. The poor representation of herbaceous elements in the pollen record may point to a filter effect against pollen influx from surrounding areas into the lake. Slope exposure may have determined the presence of Fagus or Quercus as is also seen today in cool temperate regions of the northern hemisphere. Overall, the climate appears to be more diversified than in the older floras with relatively warmer humid conditions windward of the mountains or in sheltered areas close to the lake and cooler more continental conditions leeward of the mountains.


Late Miocene Fossil Taxon Middle Late Pollen Influx Palynological Record 
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Copyright information

© Springer Science+Business Media B.V. 2011

Authors and Affiliations

  1. 1.Department of PalaeobotanySwedish Museum of Natural HistoryStockholmSweden
  2. 2.Department of PalaeontologyUniversity of ViennaViennaAustria
  3. 3.Institute of Earth SciencesUniversity of IcelandReykjavikIceland

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