Abstract
AS a result of a study of the Liassic limestones of the Dorset coast, Dr. W. A. Richardson (1923) concluded that both the limestone bands and the nodules were of secondary origin, and largely displaced the associated marls and shales. Observations made during a study of the Hydraulic Limestone Series (pre-planorbis-johnstoni subzones) in south Nottinghamshire lend support to the hypothesis of concretionary origin, but do not accord with certain other of Dr. Richardson's suggestions.
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