Well...I am not to sure about that. While it is obvious that the Inland sea of Helcar indeed covered that area given the maps published in HoME 4(The Shaping of Middle-earth) and further that the sea of rhun may very well be that vastly shrunken(given certain emendations and CT's notes in HoME 11(The War of the Jewels)) I am not sure that such a time schedual is presented. Indeed during the first age the inland sea no doubt looked different but I am not sure such a specific assumption can be drawn.
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