Miocene carpological floras of the Konin region
(Central Poland)
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Polish Academy of Sciences Museum of the Earth in Warsaw, Al. Na Skarpie 27, 00-488 Warsaw, Poland |
Online publication date: 2017-06-15
Publication date: 2017-06-15
Acta Palaeobotanica 2017; 57(1): 39–100
ABSTRACT
Carbonaceous, three-dimensionally preserved macroscopic plant remains from the Lubstów,
Gosławice and Pątnów brown coal open-pit mines are described and illustrated, providing a comprehensive
elaboration of the middle Miocene carpological floras of the Konin region. The diaspores represent the following
families: Pinaceae, Sciadopityaceae, Cupressaceae, Annonaceae, Cabombaceae, Nymphaeaceae, Araceae,
Typhaceae, Cyperaceae, Vitaceae, Rosaceae, Rhamnaceae, Fagaceae, Myricaceae, Cornaceae, Nyssaceae, Symplocaceae,
Ericaceae, Araliaceae, and Adoxaceae. Forty-two species were recognised or documented for the first
time in the Konin region. Two genera, three species and three morphotypes are described as new taxa.
Most of these plant remains represent azonal vegetation. Ericaceous bogs, pine bogs and mixed coniferous
bogs, accompanied by Gyptostrobus swamp forests and various aquatic plant communities, are suggested as the
most widespread vegetation types. Remains representing mesophytic, zonal vegetation, resembling extant evergreen
broad-leaved and mixed mesophytic forests, are sparse. A Sciadopitys raised bog, a mixed coniferous bog
subtype, was one of the important biomass sources forming the brown coal of the I-Middle Polish seam group.
Other bog types recognised in Lubstów presumably also played a part in this process. Wildfire is suggested as
an important factor controlling the Miocene vegetation of the Konin region.
The floristic composition and lithostratigraphy indicate the Badenian age (16.3–12.8 Ma) for the studied floras,
but radiometric data suggest that two Lubstów floras are older and one is younger than 13.6 Ma. Biostratigraphically,
Lubstów floras were correlated with the Klettwitz – Salzhausen floristic complex. Based on several
climatic indicators and biostratigraphic correlation, the climate is estimated to have been humid, warm-temperate
or subtropical.
The upper Miocene lower Rhenish Basin floras are the most comparable in floristic and plant communities’
composition. Tropical – subtropical, Mediterranean and extinct genera represent approximately 40% of the genera
identified in Lubstów.