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Fluvio-lacustrine cyclothems from the Oligocene of Hampshire

Published online by Cambridge University Press:  01 May 2009

B. Daley
B. Daley
Affiliation:
Geology Division, Department of Chemistry and Geology, Portsmouth Polytechnic, Portsmouth PO1 3QL
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Summary

Each fluvio-lacustrine cyclothem may include the following lithotypes (in ascending order): (a) irregularly laminated silts and muds; (b) regularly laminated muds and silts; (c) muds with or without molluscan partings and bands; (d) colour mottled muds. Each cycle reflects a change from flowing water conditions (fluvial) to non-flowing water conditions (lacustrine), culminating in some cases with the formation of marsh. Each lithotype is thought to represent the environmental changes which resulted from the silting up of inter-channel depressions on a flood plain. Successive cyclothems possibly reflect renewed flooding following an increase in river level during more pluvial periods.

Type
Articles
Information
Geological Magazine , Volume 110 , Issue 3 , May 1973 , pp. 235 - 242
Copyright
Copyright © Cambridge University Press 1973

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