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Givetian and Frasnian calcareous microbiotas of the Holy Cross Mountains

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Racki G., Sobon-Podgorska J.

Acta Palaeontologica Polonica

1992

tom 37

nr 2-4

255-289

Each developmental phase of the Givetian to Frasnian carbonate complex of the southern Holy Cross Mts is marked by distinctive calcareous microbiota. The Stringocephalus bank deposits contain a very rich, well-preserved microproblematica (of chiefly ?algal origin) dominated by calcispheroids, and many calcified cyanobacteria and green algae with filamentous Bevocastria, tubiform Devonoscale, and charophyte Trochiliscus. In the late Givetian biostromal complex more sparse microfossil associations occur, with the exception of locally abundant semitextulariid foraminifera (mainly Nanicella) and tubiform dasyclad(?) Jansaella. Also in the Frasnian back-reef facies, only limited and poorly preserved calcispheroids are identified. Contrarily, reef- and fore-reef microbiotas were present in great profusion. Microbial mats (including calcified cyanobacteria Renalcis and Sphaerocodium), associated with locally frequent solenoporids and multichambered foraminifera (Nanicella, also many nodosariids in the later Frasnian) played a significant depositional role and evidence progressive shoaling conditions within the Dyminy reef-complex.

Ograniczanie wyników

1 Acta Palaeontologica Polonica

1 Racki G.

1 Sobon-Podgorska J.

1 1992

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Givetian and Frasnian calcareous microbiotas of the Holy Cross Mountains