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Fragments of a rock unit (xenolith meaning foreign rock) which are included in another (host) rock unit must be older than the host rock. This may occur in sedimentary environments, where pieces of pre-existing rock can be ripped up and included in younger sediments. Alternatively, when igneous rocks are intruded, fragments of the country rock may be incorporated into the intrustion.*

*This was taken from my Relative Dating lab for SIO 50 Intro. to Geology/Env. Sci. course at UCSD, felt I should share it as I couldn't find this answer myself. Naureen Nayyar

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Q: What does the principle of inclusion state In geology for relating to rocks?
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