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Foraminiferal stratigraphy of Palaeogene deep-water red facies in the Gorce Mountains (Magura Nappe, Polish Outer Carpathians)

Bąk K., Bąk M., Cieśla M., Paul Z.

Annales Societatis Geologorum Poloniae

2013

Vol. 83, No. 3

201--212

The deposition of red and variegated mudstones and claystones characterized the ancient Tethys Ocean during Cretaceous and Palaeogene times, including in its north-western part, the Alpine–Carpathian deep-water basins. Palaeogene variegated sediments, containing red mudstone and claystone layers, crop out in the Gorce Mountains (Rosocha creek, near Lubomierz) in the Magura Nappe (Bystrica Subunit) of the Polish Outer Carpathians. These sediments occur as layers 1–10 cm thick and as packages of layers 2–3 m thick that are associated with very thin-bedded turbidites. The entire succession is tectonically disturbed and parts of it belong to the Ropianka, Łabowa Shale and Beloveža Formations. The sediments studied contain 27 genera and 59 species that belong to deep-water agglutinated foraminiferal (DWAF) assemblages. Tubular taxa, which are frequent in various Mesozoic–Cenozoic flysch sediments are relatively rare in the section studied. The assemblages are moderately diverse (3–20 taxa per sample). Excluding tubular forms, the most common taxa belong to Trochamminoides – Paratrochamminoides spp., Saccammina placenta, glomospirids, Recurvoides – Recurvoidella spp. and karrerulinids. The oldest part of the red sediments, referable to the Ropianka Formation, represents the upper part of the Rzehakina fissistomata Zone (probably the Upper Palaeocene). The youngest red sediments, forming thin intercalations in the Beloveža Formation, represent the acme of Reticulophragmium amplectens (middle Lutetian). Owing to tectonic disturbances, most of the Lower Eocene part of the variegated facies of the Łabowa Shale Formation is not preserved in the section studied. The upper part of it, a package 2 m thick, represents the lower part of the Reticulophragmium amplectens Zone. The small thickness (10–15 m) of the Łabowa Shale Formation in the section studied is similar to other sections in the southern part of the Bystrica Subunit. It is probably of a sedimentary nature, reflecting a decreasing number of mud-rich, gravitational flows in the southern part of the Magura Basin during the Early Eocene. Nevertheless, the strong tectonic disturbances that took place in this area during the Oligocene–Miocene folding and overthrusting influenced the reduction in thickness of these sediments.

A new species of primitive Reticulophragmium (Foraminifera) from the Paleocene Vidono Formation of northeastern Venezuela

Kaminski M. A., Crespo de Cabrera S.

Annales Societatis Geologorum Poloniae

1999

Vol. 69, No. 3-4

189-193

The new species Reticulophragmium vidonioensis Kaminski & Crespo de Cabrera is newly described from the subsurface Vidono Formation of northeastern Venezuela. The foraminiferal assemblage is dated as Zone P3 (mid Paleocene), and represents an outer neritic-upper bathyal biofacies. Reticulophragmium vidonioensis n.sp. displays very primitive morphological features, and illustrates the close evolutionary relationship between the earliest Paleocene alveolar genus Reticulophragmium and the non-alveolar genus Haplophragmoides.

Z osadów środkowego paleocenu (zona P3) formacji Vidono w północno-wschodniej Wenezueli opisano nowy gatunek Reticulophragmium vidonioensis Kaminski & Crespo de Cabrera, należący do grupy otwornic aglutynujących. Zespół otwornic z nowo opisanym taksonem reprezentuje biofacje z pogranicza strefy nerytycznej i górnego batiału. Gatunek Reticulophragmium vidonioensis n.sp. charakteryzują cechy stawiające go jako forme pośrednią pomiędzy rodzajem Reticulophragmium o alweolarnej strukturze i rodzajem Haplophragmoides nie wykazującym w budowie wewnętrznej skorupki struktury alweolarnej.