| Avalonia drifted rapidly northwards, opening the Rheic ocean until it collided with Laurentia in the Silurian during the Caledonian orogeny. |
| Several allochthons were thrust onto the Western Gneiss Complex during the Caledonian orogeny. |
| The collision of North America with the Avalon microcontinent during the Devonian Period caused the Acadian orogeny. |
| Towards the end of the orogeny, several north-south-trending strike-slip faults were active. |
| These data clearly demonstrate that parts of the Scottish basement underwent major thick-skinned tectonics during the Grenvillian orogeny. |
| Ductile thrusts that were active during the Ordovician-Silurian Caledonian orogeny divide the Moine into a scries of major nappes. |
