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Therefore, the igneous intrusion may be below a layer that is older than it.The USGS has a good introduction of relative dating to have you practice putting historical events in the correct order.Crosscutting Relations are those where one rock literally cuts across another, such as for example when igneous dikes and sills are emplaced in fractures within a pile of sedimentary rocks (see picture at left).Obviously, the sedimentary rocks had to be there prior to emplacement of the igneous rocks, and thus they are older than the igneous rocks.

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If in location B we find the same fossil assemblage (Assemblage 2) in a rock unit, we may assume that they are of essentially the same age as in location A.The order of events in the archaeological cross section shows that the oldest remains are Roman.After this the medieval remains are more recent and the industrial remains are more recent still. If you did it like many people, you based your sentences on what you know normally happens when you make a lunch. The process of putting things in a "correct order" based on experience is called relative dating.Relative dating is determining whether an object is older or younger than other objects or events.

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