Mormonism: Adam lived in the general Missouri area of the US?

Is there not room enough on the mountains of Adam-ondi-Ahman, and on the plains of Olaha Shinehah, or the land where Adam dwelt, that you should covet that which is but the drop, and neglect the more weighty matters? (D&C 117:8)

Spring Hill [Daviess County, Missouri] is named by the Lord Adam-ondi-Ahman, because, said he, it is the place where Adam shall come to visit his people, or the Ancient of Days shall sit, as spoken of by Daniel the prophet. (D&C 116:1)

Three years previous to the death of Adam, he called Seth, Enos, Cainan, Mahalaleel, Jared, Enoch, and Methuselah, who were all high priests, with the residue of his posterity who were righteous, into the valley of Adam-ondi-Ahman, and there bestowed upon them his last blessing. (D&C 107:53)

Traditional Latter-day Saints believe that Adam lived in the general Missouri area and that it was through the flood that Noah and his family sailed to the mid-East and spread from there, as depicted in the Old Testament. However, I have serious concerns about the flood being a global-wide flood, and I discuss these concerns in other posts. If Adam lived in North America, then his descendants would have had to migrate to the Mid-east prior to the advent of Abraham, as described in the Old Testament. The Bible gives no information about such a migration.

Scientists have long believed that modern humans evolved in Africa and spread from there throughout the Eastern Hemisphere. The scientists have believed this, because the earliest fossils of early humans were discovered in Africa. However, recent scientific research indicates this assumption may not be accurate. Specifically, one report indicates the anthropoids that lived anciently in Africa may have been migrants to the area rather than being native to the area. I have never felt that the fossil record supported the theory that modern civilization began in Africa. The fact that the oldest fossils of ancient humans were found in Africa only shows that the oldest fossils known so far have been found there. The fossil record does not show that ancient humans originated there.