Tolkien's final First Age timeline

[Arvegil145]

@Huinesoron

I think I found a late (c. 1968 or later) quote from an Eldarin Hands, Fingers and Numerals-related text that might be of consequence regarding the timing of the Dwarven awakening:

The Ered Luin were the remains of the mountain range that formed the eastern boundary of Beleriand (usually called by the Eldar Ered Lindon), difficult to cross. But the Dwarves had built some great Mansions in those mountains (commanding the only passes), which had certainly been founded long, even in Elvish time, before the coming of the exiled Noldor, probably before the Eldar of the Great Journey ever reached Beleriand.

- Vinyar Tengwar 48, 'Variation D/L in Common Eldarin. (Note 1)', §3, p. 24 (bold font is my addition)