Igneous intrusions can be found all around Scotland, not just in Edinburgh and Lothian. Some other examples of igneous intrusions in Scotland can be found at Dumbarton Rock (a volcanic plug in ...

Sedimentary and extrusive igneous rocks are originally laid down in horizontal layers and any change from that is viewed as a disturbance of those layers (something happened later) - folding, tilting ...

First the sediments were deposited, then the lithified sediments (rocks) were uplifted and folded, then an igneous intrusion cuts across the fold. Finally, erosion reveals it all for us to see.