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Jurassic Austroalpine (Page 29).doc

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Montanuniversität Leoben
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Chronostratigraphic age: (late) Oxfordian to (late) Tithonian to early Berriasian.

Biostratigraphy: ammonites (e.g., Perisphinctes, Waagenia, Hoplites, Trauth, 1950), Crassicollaria-, Calpionella-Zone.

Thickness: 5-40 m.

Lithostratigraphically higher rank: --

Lithostratigraphic subdivision: --

Underlying units: Scheibbsbach Formation, Arthoferkalk.

Overlying units: Blassenstein Formation.

Lateral units: lower (Tithonian) part of Blassenstein Formation (Decker, 1987), Konradsheim Formation.

Geographic distribution: Gresten Klippenzone from Großraming/Pechgraben to Scheibbs.

Remarks: Widder (1988) described intercalations of Arzbergkalk within breccias of the Konradsheim Formation and a nodular limestone that grades into a nodular breccia.

Complementary references: --

Blassenstein Formation (Blassenstein-Formation)

Validity: invalid; defined by Trauth (1950: “ ..dichten, weißlich bis lichtgrauen und hellgelblichen, dünnbankigen .. Kalken und Mergelkalken“); later on used by Decker (1987), and Schnabel (1999). Needs some revision and formalization.

Type area: UTM map sheet 4328 Scheibbs, Lower Austria (ÖK 50, map sheet 54 Melk; area of Blassenstein east of Scheibbs) (N 48°00’34”, E 015°12’09”).

Type section: not formally defined.

Remarks: Fasselgraben Formation is used for largely similar strata of the Ybbsitz Klippen Zone.

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Derivation of name: Blassenstein east of the town Scheibbs.

Synonyms: Aptychenkalk, Fleckenmergel (e.g., Bauer & Schnabel, 1997), Stollberger Schichten of Gottschling (1965).

Lithology: the main lithologies are light-grey micritic limestones, marly limestones and marls, rarely dark grey marls, marl-limestone rhytmites especially in upper part.

Fossils: rare macrofossils (aptychi, ammonites, belemnites, brachiopods); calpionellids, Saccocoma, benthic foraminifera, nannofossils; Chondrites, Zoophycos, Trichnichnus, Planolites.

Origin, facies: a pelagic limestone/marl facies of several 100 metres of waterdepth (middle shelf to bathyal).

Chronostratigraphic age: Tithonian to Aptian.

Biostratigraphy: calpionellids, nannoplankton.

Thickness: several tens of metres, varying due to strong deformation.

Lithostratigraphically higher rank: Gresten Klippen Zone.

Lithostratigraphic subdivision: “Untere -” and “Obere Blassensteinschichten” (Trauth, 1950); Lower (Tithonian-Lower Berriasian) and Upper Blassenstein (Upper Berriasian-Barremian-Aptian) Member (Decker & Rögl, 1988).

Underlying units: Konradsheim Formation, Arzbergkalk, Arthoferkalk.

Overlying units: Buntmergelserie.

Geographic distribution: from Salzburg to Vienna in the Gresten Klippen Zone.

 

 

Zementstein Beds (Zementstein-Schichten)

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Validity: invalid; but accepted as an informal unit (Zementstein-Formation) by the Swiss Stratigraphic Committee (Schweizerisches Komitee für Stratigraphie) on 19th October 2006. The name was first used by A. Heim (1907), and revised by Mohr (1992).

In Vorarlberg introduced by A. Heim (1923).

Type area: Walensee area (Switzerland).

Type section: Lochezen near Walenstadt (fide http://www.stratigraphie.ch/); approximately N 47° 7' 50'' / E 9° 16' 45'' (Swiss national coordinates: 740.000/221.600).

Reference section(s): see below.

Derivation of name: used for cement production.

Synonyms: Mergelschiefer; schieferiger Uebergangshorizont (Mylius, 1911); Zementsteinschichten (Felber & Wyssling, 1979).

Lithology: alternations of light-grey limestone (Typus "Quintner Kalk"), and dark-brown strongly weathering shales (Felber & Wyssling, 1979).

Fossils: condensed bed with abundant ammonites forms the top of the Quinten formation (Zittel, 1868; Vacek, 1879; Jeannet in Heim et al., 1933; Oberhauser, 1951; Felber & Wyssling, 1979).

An additional ammonite bed was found immediately above the lower boundary of the Zementstein Beds (Schaad, 1926; Felber & Wyssling, 1979). Further belemnites, brachiopods, calpionellids (Felber & Wyssling, 1979); benthic foraminifera, echinoderms and ostracods (Colins et al., 1990).

Origin, facies: pelagic (Felber & Wyssling, 1979).

Chronostratigraphic age: Tithonian to Berriasian.

Biostratigraphy: Lower boundary: uppermost Tithonian – Jacobi-zone (ammonites - Felber & Wyssling, 1979).

Upper boundary: uppermost Lower Berriasian – below calpionellid zone C (Felber & Wyssling, 1979).

Thickness: approximately 65 meters (Felber & Wyssling, 1979).

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Lithostratigraphic subdivision: no subformation.

Underlying units: Quinten Formation.

Overlying units: the Palfris Formation develops gradually out of the "Zementstein-Schichten". The boundary is defined by the last intercalation of micritic limestone (Typus "Quinten-Kalk") (Wyssling, 1986).

Lateral units: no information available.

Geographic distribution: Vorarlberg: Bregenzerwald (Au – Kanisfluh) of ÖK 50, sheet 112; UTM-sheet 1224.

Switzerland (Mohr & Funk, 1995).

Remarks (concerning the type area, type section and reference sections): the type section near Lochezen is tectonically truncated. The Swiss Stratigraphic Committee suggests to chose a section described by Heim (1916) at Mount Alvier as new type section (fide http://www.stratigraphie.ch/).

Complementary references: Schaad (1926), Lupu (1972), Föllmi et al., (2007).

Waschberg Unit

G. Wessely

Ernstbrunn Limestone (Ernstbrunner Kalk)

Validity: invalid; the name (Boue, 1830) was used since 19th century for Tithonian klippen within the outer Carpathian units (Hofmann, 2001); needs some revision and formalization.

Type area: in northeastern Lower Austria (map sheet ÖK 24, Mistelbach; UTM-sheet 5308, 5314).

Type section: not designated.

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Upper boundary: unknown; transgression-plane of Neogene sediments and tectonic thrust-plane within the Waschberg zone.

Lower boundary: unknown; partly conformity to Klentnitzer Schichten.

Derivation of name: small town Ernstbrunn.

Synonyms: Ernstbrunn-Formation (Wessely, 2006).

Lithology: light-grey limestones, less frequently dolomite; massive or bedded.

Fossils: e.g., ammonites, molluscs: especially Diceras; corals, algae, foraminifers.

Origin, facies: reef- to near reef carbonates.

Chronostratigraphic age: Tithonian to Berriasian, probably to Valanginian (Moshammer & Schlagintweit, 1999).

Biostratigraphy: mainly by ammonites (Zeiss, 2001).

Thickness: max. 150 m.

Lithostratigraphically higher rank unit: --

Lithostratigraphic subdivision: --

Underlying units: unknown; tectonic contact to Paleogene sediments.

Overlying units: unknown; tectonic contact to Paleogene and Neogene (Badenian) sediments.

Geographic distribution: Klippenzone of the outer ?Carpathian thrust zone of Northern Lower Austria; Moravia and Poland.

Remarks: the “Ernstbrunner Kalk” is part of the Waschberg Einheit as well as the Thaya trough (autochthonous Mesozoic at the base of the Molasse).

 

 

Klentnice Beds (Klentnitzer Schichten)

 


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