Dating 2 relating

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There are a number of different types of intrusions, including stocks, laccoliths, batholiths, sills and dikes.

Cross-cutting relations can be used to determine the relative ages of rock strata and other geological structures.

In geology, when an igneous intrusion cuts across a formation of sedimentary rock, it can be determined that the igneous intrusion is younger than the sedimentary rock.Faults are younger than the rocks they cut; accordingly, if a fault is found that penetrates some formations but not those on top of it, then the formations that were cut are older than the fault, and the ones that are not cut must be younger than the fault.Finding the key bed in these situations may help determine whether the fault is a normal fault or a thrust fault.While digging the Somerset Coal Canal in southwest England, he found that fossils were always in the same order in the rock layers.As he continued his job as a surveyor, he found the same patterns across England.

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