· PALAEOECOLOGY OF A BITUMINOUS SHALE— THE LOWER OXFORD CLAY OF CENTRAL ENGLAND by K. L. DUFF...
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· PALAEOECOLOGY OF A BITUMINOUS SHALE— THE LOWER OXFORD CLAY OF CENTRAL ENGLAND by K. L. DUFF ARSTRACT. Quantitative palaeoecological studies, using triangular plots, rarefaction