Results 321 to 330 of about 80,006 (331)
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Pre-Cambrian atmosphere:evidence from the Pre-Cambrian of Sweden

Geochimica et Cosmochimica Acta, 1956
Sedimentary haematite ores of central Sweden give evidence of the existence of an oxidizing atmosphere about 2000 × 106 years ago. This is not consistent with Rankama's conclusions from the unoxidized condition of a diorite conglomerate in Finland. Therefore a (later) Pre-Cambrian conglomerate in northern Sweden has been examined for comparison.
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The Basal Cambrian Transition and Cambrian Bio-Events (From Terminal Proterozoic Extinctions to Cambrian Biomeres)

1996
Within the Cambrian about six globally traceable extinction events are recognised, of which those across the Mid Botomian through to Toyonian/Amgan are of highest order. All events are associated with facies changes, mostly combined with stepwise extinctions that preferentially affected nearshore and endemic taxa.
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The Cambrian Plume

The Musical Times and Singing Class Circular, 1870
Henry Davies, Brinley Richards
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Cambrian English

Notes and Queries, 1879
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III Cambrian and Ordovician

Australian Journal of Earth Sciences, 1960
P.W. Pritchard, A.A. Öpik
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PRE-CAMBRIAN FOSSILS

Biological Reviews, 1962
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