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Response of Middle Jurassic benthic foraminiferal morphogroups to dysoxic/anoxic conditions in the Pieniny Klippen Basin, Polish Carpathians

, : Response of Middle Jurassic benthic foraminiferal morphogroups to dysoxic/anoxic conditions in the Pieniny Klippen Basin, Polish Carpathians. Palaeogeography Palaeoclimatology Palaeoecology 110(1-2): 55-81

The distribution of foraminiferal morphological groups has been analyzed in Upper Aalenian-Lower Bajocian black siltstones and mudstones of the Pieniny Klippen Belt, Polish Carpathians. The deposits are assigned to middle neritic, outer neritic and upper bathyal zones represented by three successions, and contain agglutinated and calcareous foraminifera assemblages. Separate classifications of agglutinated and calcareous morphogroups are established and used for a palaeoecological study. The groups are distinguished on the basis of morphological features, modes of life, and feeding habits as inferred from modem analogues. Infaunal preferences of some foraminifera have been supported by comparison with other infaunal indicators such as trace-fossil tiering and abundance of infaunal ostracods. A new quantitative method to estimate dissolution of calcareous tests has been tested on the most common genus Lenticulina. It reveals a special survival strategy of this genus in suboxic, muddy, and flocculent substrate. The distribution of morphogroups in comparison with other palaeoecological, taphonomical, and sedimentological indicators allows interpretations of organic input, rate of sedimentation, level of oxygenation, position of the redox boundary, and pH. The studied deposits represent a regional anoxic/dysoxic event which occurred within a semienclosed silled basin.


DOI: 10.1016/0031-0182(94)90110-4

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