Regular terrestrially derived palynofacies cycles in irregular marine sedimentary cycles, Lower Lias, Dorset, UK

From: Journal of the Geological Society | Date: November 1, 1999| Author: | Copyright information

Abstract: The Lower Lias of Dorset, England comprises prominent limestone marl-shale alternations considered to be obliquity orbitally controlled, probably enhanced by diagenesis. Palynofacies analysis, the study of microscopic particulate organic matter in a sediment, identifies six superimposed palaeoenvironmental variations through 12 in of this sequence: (1) 90 cm cycles in abundance of terrestrially derived organic particles, (2) 45 em cycles in abrasion of wood particles, (3) 1.2-1.8 rn cycles in shape of wood particles; (4) irregular cycles (20 cm to 5,2 m) in limestone deposition, (5) ...

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