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Age revision of Carboniferous rocks in the northern part of the Intra-Sudetic Basin (SW Poland) based on miospore data

Górecka-Nowak Anna, Jankowska Adrianna, Muszer Jolanta

Geological Quarterly

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2021

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Vol. 65, No. 1

art. no. 8

EN

Palynostratigraphic studies of the Carboniferous strata of the Szczawno and Wałbrzych formations, outcropping in the vicinity of Wałbrzych in the northern part of the Intra-Sudetic Basin, are reported. Rocks of the Szczawno Formation in a section near Konradów had earlier been assigned to the Upper Visean, while rocks of the Wałbrzych Formation in the Biały Kamień section were included to the Lower Namurian [the Stenozonotriletes triangulus-Rotaspora knoxi (TK) Miospore Zone]. This study describes abundant palynological material with many taxonomically diverse miospore assemblages from these rocks, allowing precise palynostratigraphic conclusions. These showed that the rocks of the Szczawno Formation studied should be referred to the lower part of the Serpukhovian [Verrucosisporites morulatus (Vm) Subzone], correlated with the lowest Namurian, while rocks of the Wałbrzych Formation from Biały Kamień belong to the Lower Bashkirian [Lycospora subtriquetra-Cirratriradites rarus (SR) Subzone], correlated with the Upper Namurian A. These results indicate that the rocks from both sections studied are younger than they were earlier believed. This revises the age of the Szczawno and Wałbrzych formations in the northern part of the Intra-Sudetic Basin which belong to four miospore zones, from Vm to SR, corresponding to the Serpukhovian and lowermost Bashkirian (Namurian A corresponding to the Pendleian to Alportian of British chronostratigraphy).

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Palynological constraints on the age of the Carboniferous clastic succession of SW Poland (Fore-Sudetic area) based on miospore data

Górecka-Nowak A.

Geological Quarterly

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2007

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Vol. 51, No 1

39-56

EN

New palynological studies of the Carboniferous clastic deposits of SW Poland from six deep boreholes have provided diverse, but poorly preserved miospore assemblages. Probably all of these are mixed, consisting of taxa typical of the in terval from the Famennian to the Namurian. Namurian A deposits have been identified in the Paproć 29 and Katarzynin 2 boreholes. The stratigraphic position of rocks from other profiles, where miospores were more badly preserved, has been established in a more general way. In the Objezierze IG 1 borehole the rocks were dated as not older than late Viséan while rocks from the Kalisz IG 1, Dankowice IG 1 and Dymek IG 1 boreholes are considered as not older than Viséan. The abundance of reworked miospores in rocks from the Paproć 29 and Katarzynin 2 boreholes is proof that cannibalzation of older rocks containing miospores took place in this sedimentary basin in the early Namurian. Source rocks belonged either to the Famennian-Tournaisian and Viséan or to a Viséan inter valcontaining Famennian-Tournaisian reworked miospores. Some observations on the limitations of the stratigraphical interpretation of those mixed and poorly preserved miospore assemblages are provided.

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Remarks on palynostratigraphy of the Namurian Wałbrzych Formation in the northern part of the Intrasudetic Basin (SW Poland)

Górecka-Nowak A., Majewska M.

Geological Quarterly

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2002

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Vol. 46, No 2

101-116

EN

Rich assemblages of the Namurian miospores were recorded in the deposits of the Wałbrzych Formation from the northern part of the Intrasudetic Basin. One hundred twenty five miospore taxa were determined and two miospore zones were distinguished. Deposits from Konradów and Biały Kamień belong to the Stenozonotriletes triangulus-Rotaspora knoxi (TK) Zone, correlated to the middle Namurian A. Deposits from Szczawno Zdrój appeared to be younger, because they represents the Lycospora subtriquetra-Kraeuselisporites ornatus (SO) Zone (late Namurian A).