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Recognizing unconformities is important for understanding time relationships in sedimentary sequences.An example of an unconformity is shown in Figure 8.8.

[SE ] Figure 8.9 The four types of unconformities: (a) a nonconformity between non-sedimentary rock and sedimentary rock, (b) an angular unconformity, (c) a disconformity between layers of sedimentary rock, where the older rock has been eroded but not tilted, and (d) a paraconformity where there is a long period (millions of years) of non-deposition between two parallel layers.For example, a xenolith in an igneous rock or a clast in sedimentary rock must be older than the rock that includes it (Figure 8.6).Figure 8.6a A xenolith of diorite incorporated into a basalt lava flow, Mauna Kea volcano, Hawaii.Unconformities are gaps in the geologic record that may indicate episodes of crustal deformation, erosion, and sea level variations.They are a feature of stratified rocks, and are therefore usually found in sediments (but may also occur in stratified volcanics).

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