[WIP] Building a world from tectonics onward

[MrBragg]

Alright, so continuing to hack away at this and (hopefully!) make some progress. This is the current whole-world state of things at the "present" age; all of the boundaries in the saturated colors seem to check out as reasonable from gplates while the lighter boundaries are places not fully fleshed out and are more just rough ideas (dashed red are incipient or recently failed rifts). In particular I don't really like all of the intra-oceanic subduction happening in the far north and far west of the map as those types of boundaries don't really seem occur so extensively on earth. The northern subduction arises from when the supercontinent over the north pole breaks up, so I'm not quite sure what to do there other than keep extending the subductrion zone as the fragments drift apart. I'll keep thinking about this region, but if anyone has any brilliant ideas for how to handle it--or to tell me it's fine and to stop obsessing --I'm all ears!