Schrattenkalk Formation

The Schrattenkalk Formation is a Barremian to Aptian geologic formation in the Alps. The limestone is highly karstified. Fossil ornithopod tracks have been reported from the formation.[1] Iguanodont tracks have been registered in the Swiss portion of the formation.[2] The famous north face of the Eiger is partly composed of Schrattenkalk,[3] as well as the Sturmannshöhle in southernmost Bavaria, Germany,[4] and the Hölloch (second-longest cave in Europe) and Silberen system karst caves in Switzerland.[5]

Schrattenkalk Formation
Stratigraphic range: Barremian-Aptian
Schrattenkalk in Luzern, Switzerland
TypeGeological formation
Sub-unitsLower Schrattenkalk, Rawil Member, Upper Schrattenkalk
UnderliesGarschella Formation
OverliesTierwis Formation
Thicknessup to 300 m (980 ft)
Lithology
PrimaryLimestone
OtherSandstone, mudstone
Location
Coordinates46.9751°N 8.3303°E / 46.9751; 8.3303
Approximate paleocoordinates31.6°N 18.5°E / 31.6; 18.5
RegionAlps
Country Austria
 Germany
  Switzerland
Type section
Named forSchrattenfluh
Named byBernhard Studer
Year defined1834
Schrattenkalk Formation (Switzerland)

Description

The formation is named after the Schrattenfluh in Luzern, Switzerland. The name is derived from the Swiss-German "Schratten" (a synonym of Karren) meaning clints or lapies, a phenomenon that frequently affects the limestone.[6] Kalk is limestone in German. Synonyms for the extensive formation are Hieroglyphenkalk, Calcaire à Hippurites, Urgonien, Rudistenkalk, Urgo-Aptien, Schrattenschichten, Requienenkalk, Rhodanien, Caprotinenkalk, and Urgonian Limestone.[7] The formation consists of three units, the Lower Schrattenkalk, Rawil Member and Upper Schrattenkalk.

The upper and lower units consist mostly of reefal limestones with bryozoa, gastropods, corals, sponges, brachiopods, bivalves and rudists. The Rawil Member contains beds of sandstones and mudstones containing foraminifera and echinoderms. The upper and lower members represent a photozoan-dominated carbonate platform,[8] and was deposited at the northern edge of the Tethys Ocean.[9]

Fossil content

In 2015, two new corals were described from Austria; Cairnsipsammia,[10] and Paraclausastrea vorarlbergensis.[11]

In an abandoned quarry on the shore of Lake Lucerne, close to the village of Beckenried, fossil trackways were discovered in the formation. The steeply inclined surface has more than 50 tracks (in three trackways) of ornithopod dinosaurs that are attributed to iguanodontids. Three trackways can be followed for distances of 25 to 35 metres (82 to 115 ft). The lengths of the footprints have a mean of 30 centimetres (12 in) and point to animals ranging in size of 4 to 6 metres (13 to 20 ft), with estimated hip heights between 1.8 and 2 metres (5.9 and 6.6 ft) and 1.4 to 1.7 metres (4.6 to 5.6 ft).[12]

Panorama

Panorama of the Schrattenkalk at the Schrattenfluh

See also

References

  1. Weishampel, et al. (2004). "Dinosaur distribution." Pp. 517-607.
  2. Risleten Quarry tracksite at Fossilworks.org
  3. Toni P. Labhart: Geologie der Schweiz. 5., überarb. Auflage. Ott Verlag, Thun 2001, S. 78ff.
  4. Ulrich Lagally, Stefan Glaser, Elisabeth Jobe, Georg Loth, Andreas Murr, Hubert Schmid, Wolfgang Schmid, Klaus Schwerd, Stephan Sieblitz und Ulrich Teipel: Geotope in Schwaben. In: Bayerisches Landesamt für Umwelt (Hrsg.): Erdwissenschaftliche Beiträge zum Naturschutz. Band 7. Augsburg 2009, ISBN 978-3-936385-34-2, S. 132.
  5. Jeannin, 2016, p.49
  6. Bonvallet, 2015, p.14
  7. Bodin, 2006, p.11
  8. Bodin, 2006, p.68
  9. Schrattenkalk Formation at Strati.ch
  10. Rosemarie C. Baron-Szabo (2015). "A new dendrophylliid coral genus Cairnsipsammia from the Lower Cretaceous of western Austria (Anthozoa; Scleractinia; Vorarlberg; Schrattenkalk Formation [upper Barremian-lower Aptian])". Proceedings of the Biological Society of Washington. 128 (4): 216–226. doi:10.2988/0006-324X-128.4.216.
  11. Rosemarie C. Baron-Szabo (2015). "Paraclausastrea vorarlbergensis sp. nov.; a new coral from the Lower Cretaceous of western Austria (Scleractinia; upper Barremian-lower Aptian; Schrattenkalk Fm.; Vorarlberg)". Zootaxa. 4032 (3): 327–332. doi:10.11646/zootaxa.4032.3.9. PMID 26624368.
  12. Meyer, Christian; Thuring, Basil (2003). "The First Iguanodontid Dinosaur Tracks from the Swiss Alps (Schrattenkalk Formation, Aptian)". Ichnos. 10 (2–4): 221–228. doi:10.1080/10420940390256186.

Bibliography

Further reading

  • Morycowa, E.; Decrouez, D. (2006). "Early Aptian scleractinian corals from the Upper Schrattenkalk of Hergiswil (Lucerne region, Helvetic Zone of central Switzerland)". Revue de Paléobiologie. 25 (2): 791–838.
  • Kristina Schenk: Die Drusberg- und Schrattenkalk-Formation (Unterkreide) im Helvetikum des Berner Oberlandes. Dissertation Universität Bern, 1992
  • Scholz, H. (1984). "Bioherme und Biostrome im Allgäuer Schrattenkalk (Helvetikum, Unterkreide)". Jahrbuch der geologischen Bundesanstalt. 127 (3): 471–499.
This article is issued from Wikipedia. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.