I believe the geological claims about Eden can be reconciled with Adam & Eve by a careful reading of Genesis 2:7-8.
And the LORD God formed man of the dust of the ground, and breathed into his nostrils the breath of life; and man became a living soul. And the LORD God planted a garden eastward in Eden; and there he put the man whom he had formed.
Note that man was not created in Paradise, but was placed in it after his creation. I believe Eden is “in” eternity, but was made by God as an incarnate place that links heaven & earth specially. As evolution went on outside, humans other than Adam & Eve clearly developed - for Cain had a wife outside Eden. Once our first parents entered the world, however, the stain of impurity corrupted the creation. The infection of sin spread like a contagion to every line.
For clarity about eternity vs. time, think of the relationship between “Our World” and Narnia in C.S. Lewis’ tales. There may be more reality to fiction than we fantasize about…
I once heard that the “Tree of the Knowledge of Good and Evil” in Eden is so-called because it was at that tree that man’s eyes were opened (for the worse). Its name during the events of Genesis was not “The Tree of…”, as if God would give such names to inanimate objects. The name comes, in retrospect, from the fact that this tree was where man changed. Things are often named in retrospect by the writers of Scripture. It doesn’t mean they’re just symbols… though they
are types.
At any rate, the physical Eden was destroyed by the Flood. Nothing was left untouched. Wherever it was, it is no longer there. I think there will be a lovely little city park with arbors and trees planted in the New Jerusalem, and there we will understand.