Download - Oslo Region Lithostratigraphy
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Oslo Region LithostratigraphyHans Arne Nakrem, NHM/Geology
1. Presentation of the geology (stratigraphy)2. Presentation (demo) of the web site
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Langesund
Mjsa
Blue: SilurianGreen: Cambrian andOrdoviciumViolet/red: Magmatics
Preserved as a result of east-west extension and grabenformation in Carboniferous-Permian time.
Oslo GrabenOslo Rift
Oslo
Illustration:NGU 2004
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sedimentation, different aspects of
stratigraphy, tectonics, basin evolution and magmatic processes.
Academic andindustry orientedexcursions.
The area may serveas a field laboratorywhere one canstudy:
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Norwegian Geological Survey
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The rocks continue south inSkagerrak and drillings in e.g.
the Farsund Basin haverevealed typical Oslo Cambro -Silurian fossils
Oslo Graben Off-shore
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The Cambro-Silurian rocks are mainly marine shales, sandstones andlimestones, with a rich, well studied fossil fauna (and micro flora).
Alum Shale Fm, black shale, Late Cambrian early Ordovician
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Early Ordovician Huk Fm, limestone with abundant trilobites
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Lower Silurian Solvik Fm, shale and nodular limestones
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10/17Ringerike Group, deltaic red sandstone
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Lateral variations, Early Cambrian transgression from the north
Cambrian basal conglomerate
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Literature, lithostratigraphic definitions, Cambrian
The Cambrian was formally divided by Skjeseth in 1963, but recentwork on Cambrian stratigraphy (J. P. Nystuen et al.) should result inrefinement.
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The current lithostratigraphy is
defined for the Ordovician byOwen et. al. (1990)
Literature, lithostratigraphic definitions, Ordovician
Megistaspis maximus Norways largest trilobite
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Literature, lithostratigraphic definitions, Carboniferous
The Asker Group was named by Dons and Gyry (1967), but the unit names hadbeen used, unpublished, by Henningsmoen. Henningsmoen (1978) improved thedescription, but formal type localities were not stated.
Mainly fresh- andbrackish water fossils.Limestones withmarine fossils, likefusulinids andconodonts
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Interactive web-based lithostratigraphic lexicon
Unit name Unit status (hierarchic) (Group, Formation a.s.o.)
Unit validity (synonyms etc.) Age Area (distribution) Type locality Map grid reference (UTM) Municipality
Reference (author(s), page(s))Linked:
Lithostratigraphic log (image)Type locality (photo)Map (drawing)
The database fields (structure), contain so far information about:
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Some field work is / will be carried out Preservation status of localities Correlation tool? Biostratigraphic units? Map co-ordinates, select from?
More geological maps (NGU)? Link to Fossils from the Oslo Region
Interactive web-based lithostratigraphic lexicon
Web demonstration
To be considered:
Remember thislocality?Brggers mapfrom 1887