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Geological Society, London, Special Publications; 1986; v. 21; p. 277-281;
DOI: 10.1144/GSL.SP.1986.021.01.20
© 1986 Geological Society of London

Mesozoic Palaeoceanography and Black Shales

Role of climate in affecting late Jurassic and early Cretaceous sedimentation in the North Atlantic

A. Hallam

Department of Geological Sciences, University of Birmingham, P.O. Box 363, Birmingham B15 2TT

Both regional and temporal changes in the influx of terrestrial organic matter, siliciclastic sediments and kaolinite are related to climate over the continents adjacent to the opening North Atlantic, reflecting a change from humid to arid and back to humid in North America and Europe, and more persistent aridity in Africa. Small-scale sedimentary cycles of laminated organic-rich and non-laminated organic-poor claystones have previously been interpreted in terms either of periodic influx of detrital plant material, or variations in sedimentation rate. They are here interpreted as the result of periodic stirring of bottom waters related possibly to Milankovich cycles.