An unconformity is an ‘unconformable contact’. It forms when there is a substantial interruption in sedimentation or the formation of a lacuna, and the sequence of palaeontological evolution is discontinuous. This evidence indicates that the ages of the rocks are different. The types of unconformities include angular unconformities, parallel unconformities and disconformities.
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(2020). Unconformity. In: Chen, A., Ng, Y., Zhang, E., Tian, M. (eds) Dictionary of Geotourism. Springer, Singapore. https://doi.org/10.1007/978-981-13-2538-0_2635
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