According to the inclusions principle, any rock fragments that are incorporated into a rock must be older than the rock itself.
A sedimentary clast or an igneous xenolith, for instance, must be older than the rock that contains them.
What can you learn about inclusions from geological principles?
Any rock fragments in a sedimentary layer must be older than the layer itself, according to the inclusions principle. A conglomerate's cobbles, for instance, must have formed before the conglomerate itself.
In geology, what are inclusions?
An inclusion, according to mineralogists, is anything that gets stuck inside a mineral as it forms. That substance might be a rock encased in another rock. It could be a feather or a bug caught in amber. It could be a gas bubble contained within a gem.
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