Evolution of Eoparastaffella and the Tournaisian-Visean
boundary in Mokrá near Brno (Czech Republic)

D 2003

Evolution of Eoparastaffella and the Tournaisian-Visean boundary in Mokrá near Brno (Czech Republic)

KALVODA, Jiří

Basic information

Original name

Evolution of Eoparastaffella and the Tournaisian-Visean boundary in Mokrá near Brno (Czech Republic)

Authors

KALVODA, Jiří (203 Czech Republic, guarantor)

Edition

Utrecht, International Congress on Carboniferous and Permian Stratigraphy, p. 267-269, 3 pp. 2003

Publisher

Netherlands Institute for Applied Geoscience

Other information

Language

English

Type of outcome

Stať ve sborníku

Field of Study

10500 1.5. Earth and related environmental sciences

Country of publisher

Netherlands

Confidentiality degree

není předmětem státního či obchodního tajemství

RIV identification code

RIV/00216224:14310/03:00008245

Organization unit

Faculty of Science

ISBN

90-5986-024-1

Keywords in English

Foraminifers; Tournaisia/Visean boundary

Abstract

V originále

The subgenera of Eoparastaffella have been studied together with morphologically very close Eoendothyranopsis in profiles of the Tournaisian-Visean boundary beds in the Mokra quarries (Moravia, Czech Republic). The profiles are composed both of the alternation of limestones and red to green shales and the alternation of biodetrital and biomicritic limestones with thin shale intercalations. The joint presence of shallow water bioclasts (foraminifers, algae, calcispheres, crinoids, rugose corals etc.) and deeper water fauna (conodonts - abundant gnathodids, Scaliognathus, trilobites) as well as apparent gradations suggest that most of the limestones can be regarded as calciturbidites. The sediments correspond to different parts of a halfgraben basin; they were deposited in the beginning of a compression regime cycle and represent a transition to overlying typical flysch sequences. The different facies are folded and convergent in complicated overthrust tectonics. The shales contain locally abundant trilobites and brachiopods, ammonites are less frequent. In the lower part of the sequences, biodetrital often sandy limestones predominate, the proportion of biomicritic limestones increases to the top of the profile. Dominant microfacies are packstones and wackestones; grainstones are less frequent. The matrix of grainstones consists of microsparite and pseudosparite, partly resulting of the recristallization of the original micritic matrix. Crinoids are the most abundant bioclasts, foraminifers, grains of quartz, calcispheres, ostracodes, red algae (Solenoporaceae), moravamminids, brachiopods, bryozoans, trilobites, blue-green algae, trilobites, bivalves, intraclasts and conodonts occur as well. The quite frequent conodont taxa belong to the Scaliognathus anchoralis Zone and the Gnathodus texanus Zone of the standard conodont zonation. Nevertheless, neither Gnathodus texanus (ROUNDY, 1926) nor Gnathodus homopunctatus ZIEGLER, 1962 have been found so far and Mestognathus beckmanni BISCHOFF, 1957 represents the only typical Visean species. In the uppermost Tournaisian part of the profile Eoendothyranopsis and Eoparastaffellina is frequent while Eoparastaffella representatives predominate in the Visean. Eoparastaffella simplex VDOVENKO, 1954 is the most frequent species coexisting with E. ovalis VDOVENKO, 1954 and E. iljtchiensis POSTOJALKO, 1975. E. evoluta VDOVENKO, 1971 and E. pseudochomata VDOVENKO were determined from older samples. Among evolutionary older eoparastaffellins Eoparastaffellina rotunda VDOVENKO, 1971 was distinguished both below and above the Tournaisian-Visean boundary. The taxonomic assignment of some eoparastaffellins as well as the distinction between some eoparastaffellins and Eoendothyranopsis (Ninella) is still a matter of research. The following species of Ninella have been recognized in the profiles: E. (Ninella) donica BRAZHNIKOVA et ROSTOVTSEVA, 1964, E. (Ninella) lebedevae SOLOVIEVA, 1967, E. (Ninella) moravica ONDRACKOVA, 2001, E. (Ninella) aksarsaica MICHNO, 1975, E. (Ninella) transita LIPINA, 1955. The first occurrence of Mestognathus beckmanni BISCHOFF, 1957. has been recently found, contrary to the previous data of Kalvoda & Ondrackova (1999), below the entry of E. simplex VDOVENKO, 1954. Between the first occurrence of Mestognathus beckmanni BISCHOFF, 1957 and the last occurrence of Scaliognathus anchoralis BRANSON & MEHL, 1941 stratigraphically diagnostic species are lacking. The conodont fauna at this level is characterized by the abundance of Gnathodus (Gnathodus Horizon - see Fig. 1). A similar horizon can be distinguished also in the Pengchong section (Guangxi Autonomous Region, South China) (Sevastopulo et al. 2002).

Links

GA205/02/0897, research and development project

Name: Systematika zástupců rodu Eoparastaffella (Foraminifera) při hranici tournai a visé

Investor: Czech Science Foundation, Systematics of the genus Eoparastaffella (Foraminifera) at the Tournaisian-Visean boundary

MSM 143100004, plan (intention)

Name: Geologické procesy a jejich environmentální vyústění - styk variscid a alpid

Investor: Ministry of Education, Youth and Sports of the CR, Geological Processes and their Environmental Impact - Contact of the Variscides and Alpides

Citovat

KALVODA, Jiří. Evolution of Eoparastaffella and the Tournaisian-Visean boundary in Mokrá near Brno (Czech Republic). In International Congress on Carboniferous and Permian Stratigraphy. Utrecht: Netherlands Institute for Applied Geoscience, 2003, p. 267-269. ISBN 90-5986-024-1.

@inproceedings{489674,
   author = {Kalvoda, Jiří},
   address = {Utrecht},
   booktitle = {International Congress on Carboniferous and Permian Stratigraphy},
   keywords = {Foraminifers; Tournaisia/Visean boundary},
   language = {eng},
   location = {Utrecht},
   isbn = {90-5986-024-1},
   pages = {267-269},
   publisher = {Netherlands Institute for Applied Geoscience},
   title = {Evolution of Eoparastaffella and the Tournaisian-Visean boundary in Mokrá near Brno (Czech Republic)},
   year = {2003}
}

TY  - JOUR
ID  - 489674
AU  - Kalvoda, Jiří
PY  - 2003
TI  - Evolution of Eoparastaffella and the Tournaisian-Visean boundary in Mokrá near Brno (Czech Republic)
PB  - Netherlands Institute for Applied Geoscience
CY  - Utrecht
SN  - 9059860241
KW  - Foraminifers
KW  - Tournaisia/Visean boundary
N2  - The subgenera of Eoparastaffella have been studied together with morphologically very close Eoendothyranopsis in profiles of the Tournaisian-Visean boundary beds in the Mokra quarries (Moravia, Czech Republic). The profiles are composed both of the alternation of limestones and red to green shales and the alternation of biodetrital and biomicritic limestones with thin shale intercalations. The joint presence of shallow water bioclasts (foraminifers, algae, calcispheres, crinoids, rugose corals etc.) and deeper water fauna (conodonts - abundant gnathodids, Scaliognathus, trilobites) as well as apparent gradations suggest that most of the limestones can be regarded as calciturbidites. The sediments correspond to different parts of a halfgraben basin; they were deposited in the beginning of a compression regime cycle and represent a transition to overlying typical flysch sequences. The different facies are folded and convergent in complicated overthrust tectonics. The shales contain locally abundant trilobites and brachiopods, ammonites are less frequent. In the lower part of the sequences, biodetrital often sandy limestones predominate, the proportion of biomicritic limestones increases to the top of the profile. Dominant microfacies are packstones and wackestones; grainstones are less frequent. The matrix of grainstones consists of microsparite and pseudosparite, partly resulting of the recristallization of the original micritic matrix. Crinoids are the most abundant bioclasts, foraminifers, grains of quartz, calcispheres, ostracodes, red algae (Solenoporaceae), moravamminids, brachiopods, bryozoans, trilobites, blue-green algae, trilobites, bivalves, intraclasts and conodonts occur as well. The quite frequent conodont taxa belong to the Scaliognathus anchoralis Zone and the Gnathodus texanus Zone of the standard conodont zonation. Nevertheless, neither Gnathodus texanus (ROUNDY, 1926) nor Gnathodus homopunctatus ZIEGLER, 1962 have been found so far and Mestognathus beckmanni BISCHOFF, 1957 represents the only typical Visean species. In the uppermost Tournaisian part of the profile Eoendothyranopsis and Eoparastaffellina is frequent while Eoparastaffella representatives predominate in the Visean. Eoparastaffella simplex VDOVENKO, 1954 is the most frequent species coexisting with E. ovalis VDOVENKO, 1954 and E. iljtchiensis POSTOJALKO, 1975. E. evoluta VDOVENKO, 1971 and E. pseudochomata VDOVENKO were determined from older samples. Among evolutionary older eoparastaffellins Eoparastaffellina rotunda VDOVENKO, 1971 was distinguished both below and above the Tournaisian-Visean boundary. The taxonomic assignment of some eoparastaffellins as well as the distinction between some eoparastaffellins and Eoendothyranopsis (Ninella) is still a matter of research. The following species of Ninella have been recognized in the profiles: E. (Ninella) donica BRAZHNIKOVA et ROSTOVTSEVA, 1964, E. (Ninella) lebedevae SOLOVIEVA, 1967, E. (Ninella) moravica ONDRACKOVA, 2001, E. (Ninella) aksarsaica MICHNO, 1975, E. (Ninella) transita LIPINA, 1955. The first occurrence of Mestognathus beckmanni BISCHOFF, 1957. has been recently found, contrary to the previous data of Kalvoda & Ondrackova (1999), below the entry of E. simplex VDOVENKO, 1954. Between the first occurrence of Mestognathus beckmanni BISCHOFF, 1957 and the last occurrence of Scaliognathus anchoralis BRANSON & MEHL, 1941 stratigraphically diagnostic species are lacking. The conodont fauna at this level is characterized by the abundance of Gnathodus (Gnathodus Horizon - see Fig. 1). A similar horizon can be distinguished also in the Pengchong section (Guangxi Autonomous Region, South China) (Sevastopulo et al. 2002).
ER  -

KALVODA, Jiří. Evolution of Eoparastaffella and the Tournaisian-Visean boundary in Mokrá near Brno (Czech Republic). In \textit{International Congress on Carboniferous and Permian Stratigraphy}. Utrecht: Netherlands Institute for Applied Geoscience, 2003, p.~267-269. ISBN~90-5986-024-1.

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