The warning about the text below being written by a nube should be properly repeated before every paragraph; please be patient ;)
cedh audmanh wrote:
However, I mentioned the possibility of an ice age land bridge recently
, and that scenario presupposes that there is actually overriding continental crust north of the Ttiruku Arc. Probably the eastern half would simply be a mostly-below-sea-level extension of Tuysáfa, about the same width as the western tip of that continent, while the western half (i.e. Sumarušuxi) might be more compact and possibly (partly) split off by a stress fracture in the W Tuysáfa plate, caused by the push of the Siixtaguna plate.
The idea of the landbridge, and of the Ttiruku Arc (or a significant portion of it) being an elevated part of a larger sunken landmass, seems to change a lot in terms of tectonics, right? And will require some revision of the maps anyway, probably?
And, on the other hand, revision of island *sizes* is not really necessary with it; is this correct?
Incidentally, when I first joined Akana, I perceived Ttiruku as an equivalent of New Guinea (which was only twice as optimistic, in terms of square miles, as Radius' more accurate current estimate), and the Ttiruku Arc as an equivalent of Indonesia.
Looking at the islands while viewing them as a sunken mountainous area is interesting, too. When inventing my scenario about Ttiruku as a region of extreme diversity etc., I imagined the island to have rather fractured relief. I thought of two or maybe three roughly parallel mountain ridges running E to W, with their spurs dividing most of the territory into small plateaus and valleys, whose inner portions would be partly levelled by alluvial processes at different heights.
But the coastline of Ttiruku as seen in our current maps, with peninsulas protruding in different directions, may suggest something more interesting. Basically, it looks like a node where several mountain ridges meet (their projections crossing not necessarily at exactly one point), and those ridges seem to run in three different directions (roughly, W-E, NW-SE, N-S).
Continuations of those ridges could be three groups of islands. The major one is already present in our maps as the western part of the Ttirukuan Archipelago (which is the eastern half of the larger Ttiruku Arc). The other two could be composed of much smaller islands, and our current maps don't show them yet.
* * *
One of them, which I'll tentatively label the Eastern Stopover Islands, would run N-to-S roughly parallel to (but not necessarily very close to) the western coast of Tuysáfa. These islands were part of the route in which the Tymúlaslì reached their ultimate home in the North.
The potential traces of a rather odd substrate in Máotatšàlì suggest that the islands weren't uninhabited, i. e. could be colonized by much more primitive folks a couple millennia before the start of the Isles Exodus.
* * *
The other group, the Eastern Stopover Islands, lies to the NW of Ttiruku. This is the area where the Mûtsinamtsys had gained enough strength to rival the Takuña by early 1st millennium BP.
Before the arrival of the Mûtsinamtsys the islands were probably uninhabited, i. e. they couldn't be reached until the Isles speakers appeared, having accumulated some nautical skills during the first phase of their migrations (along the coast of Ttiruku). This follows from my current vision of Mûtsipsa': no important innovations shared with other branches of the Isles family, no clear signs of contact influences, but instead a bunch of extremely conservative retentions of Early Proto-Isles features; all of this may suggest an early isolation.
It appears that pre-Mûtsinamtsys became a robust seafaring nation when still on the Eastern Stopover Islands; the arrival of Mûtsinamtsys at their new northern home looks like an organized colonization to me.
* * *
The above wants a headline like "Northern Route Hypothesis Triumphantly Coming Back" (this time the Northern Route starting from Ttiruku instead of Tuysáfa).
Yet there are problems that are obvious even to me.
As I understand it, Cedh's idea is that only a small portion of the Siixtaguna Ocean represents sunken continental crust; supposing this for much of the ocean would be probably utterly unrealistic.
But this means that the Stopover Islands as proposed above help to cross only a small portion of the distance between Ttiruku and the Northern Islands. A huge space remains in between, clearly too large for navigation methods available to most advanced nations of Antiquity.
Therefore, we still need some islands scattered over that space - perhaps, Polynesian-style volcanic archipelagos as with Radius' proposal
Radius Solis wrote:
So adjacent continental crust is crucial to getting those large islands to happen at subduction zones, and in Ttiruku there clearly isn't any that's close enough. If there were, it would be evidenced by (at minimum) a number of equally large islands set back a ways from the front of the Ttiruku arc - like Indonesia, which has Borneo and Sulawesi and the Malay peninsula behind the islands of the arc front.
2. Draw in a bunch of new large islands behind the front arc. And it will take lots, or extremely large ones, because it's an awfully long island chain - fully the equal of Indonesia's.
Can it help somehow if we consider the Ttirukuan Archipelago and the Sumarušuxi as formations of different types? (Cedh seems to point to something of that sort, but I am not sure I understand his idea...)
For example, if only the Ttirukuan Archipelago (i. e. the eastern half of the Arc) represents the type of formation in question: where would the front part be, and where would you expect the missing big islands to be located?
Also, why continental crust can happen to be less thick (like in Indonesia)? What shapes can be imagined for areas of such thinner-than-usual continental crust, and why?
Radius Solis wrote:
There's no doubt that many features of Akana conlangs are in the same position, and some of this just has to be accepted because we can't know everything about everything, and the most important thing is that everyone enjoy their participation.
At the level of detail we have with our typical descriptions, I don't think we have anything utterly implausible. Some diachronic scenarios might be in fact odd though, and no-one has ever cared e. g. about glottochronology (in which one may believe or not, but having one's Swadesh 100-word list unchanged in 3 KY, or 50% replaced in 500 years [EDIT: except with loans], would look totally unlikely; luckily, our languages don't seem to have complete Swadesh-100's...)