Temat: paleoekologia - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Palaeontological analysis of Middle Miocene siltstones at Wiślica (Carpathian Foredeep, Poland)
Autorzy:: Płonka, K.
Powiązania:: https://bibliotekanauki.pl/articles/94418.pdf
Data publikacji:: 2017
Wydawca:: Uniwersytet im. Adama Mickiewicza w Poznaniu
Tematy:: microfossils
foreland basin
foraminifera
palaeoecology
mikroorganizmy
dorzecze
paleoekologia
Opis:: Middle Miocene siltstones of the Skawina Formation that crop out at Wiślica, within the axial part of the Carpathian Foredeep in Poland, were analysed. The deposits studied contain numerous benthic and planktonic foraminifera, ostracods, echinoid spines, bryozoans, bivalves and otoliths. The fossils recognised document an early ‘Badenian’ (= Langhian in the Mediterranean area), or, more precisely, ‘Moravian’ age of the deposit. Palaeoecological analysis suggests normal-marine conditions with full salinity. The studied siltstones were deposited from middle–lower shoreface to lower–offshore, warm surface water and locally suboxic to dysoxic conditions in the sediment.
Źródło:: Geologos; 2017, 23, 1; 29-43
1426-8981
2080-6574
Pojawia się w:: Geologos
Dostawca treści:: Biblioteka Nauki

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Tytuł:: Representatives of the family Actinostromatidae (Stromatoporoidea) in the Devonian of southern Poland and their ecological significance
Autorzy:: Wolniewicz, P.
Powiązania:: https://bibliotekanauki.pl/articles/94291.pdf
Data publikacji:: 2016
Wydawca:: Uniwersytet im. Adama Mickiewicza w Poznaniu
Tematy:: Central Europe
sponges
palaeoecology
palaeoenvironmental variation
intraskeletal variation
Europa Środkowa
gąbki
paleoekologia
zróżnicowanie paleośrodowiskowe
Opis:: Stromatoporoids of the family Actinostromatidae are common constituents of Givetian to Frasnian (Devonian) organic buildups. The species-level structure of actinostromatid assemblages from the Devonian of southern Poland is described in the present paper, with special emphasis on ecological factors that influenced species composition of the communities. Nine species of the genera Actinostroma and Bifariostroma are distinguished. Members of the family Actinostromatidae predominated in stromatoporoid assemblages within lower Frasnian carbonate buildup margins. The most diverse actinostromatid faunas were found within the middle Givetian Stringocephalus Bank, in the upper Givetian–lower Frasnian biostromal complex and in the lower Frasnian organic buildups. Species-level biodiversity was lowest within detrital facies which surrounded the Frasnian carbonate buildups. Species of Actinostroma with well-developed colliculi are commonest within the middle Givetian to early Frasnian coral-stromatoporoid biostromal complexes, whereas species with strongly reduced colliculi predominate early-middle Frasnian organic buildups. The skeletal structure of actinostromatids reflects environmental changes, documenting a transition from species with thin, close-set pillars and widely spaced laminae (common in the middle Givetian) to those with long, thick pillars and megapillars (in Bifariostroma), which were predominant during the early and middle Frasnian. The distribution of growth forms among species reveals a significant intraspecific variation. Species of Actinostroma can be either tabular or low domical, depending on the palaeoenvironmental setting. Thus, the present study confirms that stromatoporoid morphology was influenced by environmental conditions.
Źródło:: Geologos; 2016, 22, 3; 227-249
1426-8981
2080-6574
Pojawia się w:: Geologos
Dostawca treści:: Biblioteka Nauki

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