Geoff,

You must be a detective - Most of the visuals are fairly obviously named, but the three that you have picked out probably have the most abstract name derivation of all the visuals on the empeg.

An orogeny or orogenic episode is a period of uplift of the earths crust, or mountain building. This occurs when the tectonic plates that make up the surface of the planet are forced together as two continents collide. For example, the Alps were formed during the Alpine orogeny. The orogeny doesn't usually have the same name as the mountains formed by it, this is because some mountain belts can be reactivated by later orogenic episodes, and thus the word orogeny refers to specific period of tectonic uplift, not the uplifted area.

You also spotted my trick that was supposed to catch people out by making them think that the suite of visuals are named after tartans as two of the orogenies named are associated with tectonic uplift in Scotland - And you even spotted the South West of England association (although the Hercynian orogeny is also associated with uplift in other parts of Europe (NW Spain))

I'll now be forced to use more cunning and abstract names in the future.

What this space!
Toby