[SunkenCiv]

There's plenty of room on the calendar for the equivalent of our civilization to have come and gone a bunch of times, and as you said, glaciers would do a job on anything humans can build. And any small artifacts ("out-of-place" or OOPs) found would be (are?) dismissed out of hand.

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Plato Prehistorian: 10,000 to 5000 B.C. Myth, Religion, Archaeology by Mary Settegast paperback

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[SunkenCiv]

In her Plato Prehistorian: 10,000 to 5000 B.C. Myth, Religion, Archaeology, Mary Settegast reproduces a table which shows four runic character sets; a is Upper Paleolithic (found among the cave paintings), b is Indus Valley script, c is Greek (western branch), and d is the Scandinavian runic alphabet.

[Explorer89]

I am of the mind that whatever was built was (as GraceG said) was clustered around the rivers and sea shores, and subsequently inundated. Witness the Chesapeake Bay, which is actually the Susquehanna River basin.....flooded. Right before the river enters the bay, it cuts through a gorge (part of which is flooded behind the Conowingo Dam). There is a sign along one of the trails that says that the gorge was cut by the meltwaters from the glaciers. It must have been fantastic, as the sides of the gorge are granite.

[SunkenCiv]

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The Lost Civilizations of the Stone Age by Richard Rudgley

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[Explorer89]

Meh, can’t find an e-book of it! Rats.