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The Relative Age of Concretions

Published online by Cambridge University Press:  01 May 2009

W. Alfred Richardson
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Extract

The age of a concretion, relative to that of the parent-rock, must be either:—

1. Contemporaneous.—The concretion grew on the sea-floor at the same time, and at about the same rate, as the surrounding deposit was laid down.

2. Penecontemporaneous.—The concretion segregated more or less close to the surface of recently deposited sediment.

3. Subsequent.—The concretion formed after deposition had finished, and after the strata had largely consolidated, but, perhaps, before cementation had taken place to any noteworthy extent.

Type
Original Articles
Information
Geological Magazine , Volume 58 , Issue 3 , March 1921 , pp. 114 - 124
Copyright
Copyright © Cambridge University Press 1921

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References

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