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NARROW
GeoRef Subject
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all geography including DSDP/ODP Sites and Legs
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Europe
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Western Europe
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Scandinavia
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Sweden
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Skane (1)
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fossils
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Invertebrata
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Arthropoda
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Trilobitomorpha
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Trilobita (1)
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geologic age
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Paleozoic
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Cambrian (1)
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minerals
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carbonates (1)
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Primary terms
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Europe
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Western Europe
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Scandinavia
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Sweden
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Skane (1)
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Invertebrata
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Arthropoda
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Trilobitomorpha
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Trilobita (1)
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Paleozoic
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Cambrian (1)
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sea-level changes (1)
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sedimentary rocks
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clastic rocks
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mudstone (1)
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sedimentary structures
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biogenic structures
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bioturbation (1)
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rock formations
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Alum Shale Formation (1)
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sedimentary rocks
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sedimentary rocks
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clastic rocks
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mudstone (1)
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siliciclastics (1)
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sedimentary structures
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sedimentary structures
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biogenic structures
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bioturbation (1)
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sediments
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siliciclastics (1)
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The Cambrian Alum Shale Formation in the Andrarum-3 core from Scania, southern Sweden, consists of black siliciclastic mudstone with minor carbonate intercalations. Four facies comprise three siliciclastic mudstones and one fine-grained carbonate. The facies reflect deposition along a transect from deep ramp to basin on a Cambrian shelf. The three mudstone facies contain abundant clay clasts and laterally variable siltstone laminae. Bed-load transport processes seem to have dominated deposition on this deep shelf. These sedimentary rocks record mainly event deposition, and only relatively few, thin laminae probably resulted from suspension settling. The Alum Shale Formation deep shelf did not show a bioturbation gradient, but fecal strings are common and Planolites burrows are rare in all mudstone facies. Evidence for biotic colonization indicates that this mudstone environment was not persistently anoxic, but rather was most likely intermittently dysoxic. The Alum Shale Formation in the Andrarum-3 core shows an overall decrease of grain size, preserved energy indicators, and carbonate content upsection interpreted to reflect a deepening upward. The succession can also be divided into four small-scale fining-upward cycles that represent deepening, and four overlying coarsening-upward cycles that represent upward shallowing.