Abstract
Palynological analysis of the 1st mid-Polish lignite seam (MPLS-1) of the Drzewce deposit (Konin region, central Poland) was used as the data source for palaeoenvironmental and palaeoclimatic interpretations. Lignites of the 1st group developed in the middle Miocene, during and shortly after the last peak of the Mid-Miocene Climatic Optimum, over a large area of Poland, and they are the youngest of the main Neogene lignite seams in Poland. In the Konin region, these lignites have a relatively significant thickness (up to 20 m) and therefore they are (or were in the past) exploited in several open-pit mines. A total of 36 palynological samples from the 6.3-m-thick seam of the Drzewce opencast mine was studied in detail. Palynological analysis of the lignite seam indicates that the area was overgrown by palustrine wetland communities, similar in composition to modern pocosins. The most characteristic elements of them were shrubs in the Ericaceae family. The climate at that time was warm temperate and humid. The estimated mean annual temperature (MAT) for the lignite seam at Drzewce is 15.7–17.8 °C. Comparison with other palynofloras from the MPLS-1 shows that the climate during the formation of the group of seams was more or less homogenous across the entire Polish Lowlands. Sedimentological data and results of palynological studies (including NPPs) at Drzewce indicate that the palaeomires were relatively distant from the channels of the river system in the Konin Basin. The fossil fungal assemblage indicates dense vegetation on damp, swampy soils and the presence of small, shallow-water bodies, with a variable water level or even periodic reservoirs, existing only during the wet season or after floods. In small, flooded depressions, such as the pools in bogs, filamentous green algae occurred. The presence of zygospores of the desmids Desmidiaceaesporites cosmarioformis most probably indicates relatively nutrient-poor (ombrotrophic) conditions. Fluctuations in the frequency of individual plant taxa (including Sequoia and Sciadopitys ) are likely to reflect changes in water level and trophic conditions.
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Claims 11
Claim · model-written summary
The area was covered by wetland communities resembling modern pocosins.
Verbatim
e0“the area was overgrown by palustrine wetland communities, similar in composition to modern pocosins”
Claim · model-written summary
Ericaceae shrubs were characteristic of the wetland communities.
Verbatim
e0“The most characteristic elements of them were shrubs in the Ericaceae family”
Claim · model-written summary
The reconstructed climate was warm temperate and humid.
Verbatim
e0“The climate at that time was warm temperate and humid”
e1“palustrine wetland communities”
Claim · model-written summary
Estimated mean annual temperature was 15.7–17.8 °C.
Verbatim
e0“The estimated mean annual temperature (MAT) for the lignite seam at Drzewce is 15.7–17.8 °C”
e1“palustrine wetland communities”
Claim · model-written summary
Climate during seam formation was broadly homogeneous across the Polish Lowlands.
Verbatim
e0“the climate during the formation of the group of seams was more or less homogenous across the entire Polish Lowlands”
e1“palustrine wetland communities”
Claim · model-written summary
The palaeomires were relatively distant from river channels.
Verbatim
e0“the palaeomires were relatively distant from the channels of the river system in the Konin Basin”
e1“palustrine wetland communities”
Claim · model-written summary
The fossil fungal assemblage indicated dense vegetation on damp swampy soils and shallow water bodies.
Verbatim
e0“The fossil fungal assemblage indicates dense vegetation on damp, swampy soils and the presence of small, shallow-water bodies”
Claim · model-written summary
Filamentous green algae occurred in flooded bog depressions.
Verbatim
e0“In small, flooded depressions, such as the pools in bogs, filamentous green algae occurred”
Claim · model-written summary
Desmidiaceaesporites cosmarioformis zygospores suggest nutrient-poor conditions.
Verbatim
e0“The presence of zygospores of the desmids Desmidiaceaesporites cosmarioformis most probably indicates relatively nutrient-poor (ombrotrophic) conditions”
Claim · model-written summary
Fluctuations in Sequoia frequency likely reflect water-level and trophic changes.
SequoiaNot reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Fluctuations in the frequency of individual plant taxa (including Sequoia and Sciadopitys ) are likely to reflect changes in water level and trophic conditions”
Claim · model-written summary
Fluctuations in Sciadopitys frequency likely reflect water-level and trophic changes.
- Taxon
- Sciadopitys
_-_Flickr_-_S._Rae_(1).jpg?width=60)
Sciadopityse0 - Outcome
- Fluctuations in the frequencye0
- Setting
- water level and trophic conditionse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
_-_Flickr_-_S._Rae_(1).jpg?width=500)
Verbatim
e0“Fluctuations in the frequency of individual plant taxa (including Sequoia and Sciadopitys ) are likely to reflect changes in water level and trophic conditions”