Describe relative absolute dating techniques

Posted by / 19-Jul-2017 20:23

Let's say, in this set of rock strata, that we found a single intrusion of igneous rock punching through the sedimentary layers.

We could assume that this igneous intrusion must have happened after the formation of the strata.

Following the Principle of Original Horizontality, he could say that whatever forces caused the deformation, like an earthquake, must have occurred after the formation of all the rock strata.

There may be a layer missing in the strata, or a set of sedimentary rock on top of metamorphic rock.

These interfaces between discontinuous layers of rock are called unconformities.

Since we assume all the layers were originally horizontal, then anything that made them not horizontal had to have happened after the fact.

We follow this same idea, with a few variations, when we talk about cross-cutting relationships in rock.

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Geologists find the cross-cutting principle especially useful for establishing the relative ages of faults and igneous intrusions in sedimentary rocks.

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  1. Maybe I’m just not really portraying myself very well in my profile or something. RD: Do you think the algorithm and the other tools the dating sites offer help at all? I mean, I like the fact that you can IM with people when they’re online if you want, but as far as the “matching algorithm” goes, I don’t think it really works very well.