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Facies

, 28:87 | Cite as

Genesis of stromatactis in an upper jurassic carbonate buildup (Mlynka, Cracow region, Southern Poland): Internal reworking and erosion of organic growth cavities

  • Jacek Matyszkiewicz
Article

Summary

The Middle Oxfordian strata in the southern part of the Cracow-Wielun Upland consist of platy and bedded limestones (‘normal facies’), of massive limestones as well as locally of mass flow sediments. Massive limestones, prevailing in the Upper Oxfordian, form commonly carbonate buildups, which are made up predominantly of cyanobacterial allochems and to a minor amount of siliceous sponges.

Stromatactis can be best observed in the Mlynka quarry. They occurs in the uppermost part of slope sediments close to a cyanobacterial-sponge buildup. The bedding-plane of the slope sediments is directly overlain by debris-flow and grain-flow sediments.

Fragments of a primary laminar framework rich in growth-cavities occur in the uppermost part of the slope sediments as precondition for the formation of stromatactis. The stromatactis cavities were formed by internal reworking and erosion within these organic growth cavities, caused by strong bottom currents due to mass transport from higher parts of the buildup.

Keywords

Stromatactis Cyanobacterial Sponge Buildup Initial Framework Growth Cavity Internal Reworking Mass Flow Southern Poland Upper Jurassic 

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Copyright information

© Institut für Palaentologie, Universitat Erlangen 1993

Authors and Affiliations

  • Jacek Matyszkiewicz
    • 1
  1. 1.Institute of Geology and Mineral ResourcesAcademy of Mining and MetallurgyCracowPoland

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