I recall reading here or somewhere else, that proto-Indians had actually lost the use of archery at one point in prehistory, and re-discovered its use sometime later. This is supposedly based on archaeology.

Does anyone have more on this?

Thanks!!!

Finding intact primitive bows is a rare occurence.  The few good European specimens have all been recovered from bogs or sea-bottom.
In The Bowyer's Bible series, they mention a few found in Western states, where the dry air is a better preservative than the Eastern woodlands, or the Northwest.

yep good point - but it's possible that flint was scarce and a sharp fire hardened point to an arrow is still very effective.

With something as simple as a bow it's unlikely the technology would be lost. You would have to both forget how to make string (or use sinew) and ignore the tales of your ancestors - bear in mind we're dealing with a culture with a verbal history. Stories are much harder to lose than books. 
The whole tribe whould have knowlege of the stories to some degree.

It's probably more likely that different materials were used that either haven't been recognised/dug up or that didn't stay whle once discarded.