Abstract
In terms of geological history an unconformity represents a period of time during which strata are not laid down. During this period, strata already formed may be uplifted and tilted by earth-movements which also terminated sedimentation. The uplifted strata, coming under the effects of sub-aerial weathering and erosion, are ’worn down’ to a greater or lesser extent before subsidence causes the renewal of sedimentation and the formation of further strata. As a result we find, in the field, one set of strata resting on the eroded surface of an older set of beds.
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© 1990 G. M. Bennison
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Bennison, G.M. (1990). Unconformities. In: An Introduction to Geological Structures and Maps. Springer, Boston, MA. https://doi.org/10.1007/978-1-4615-9630-1_3
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DOI: https://doi.org/10.1007/978-1-4615-9630-1_3
Publisher Name: Springer, Boston, MA
Print ISBN: 978-1-4615-9632-5
Online ISBN: 978-1-4615-9630-1
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