Under what circumstances does it appear that paleolithic humans first used boats?

Answer 1

Probably the earliest boats were used on rivers -- to cross them, transport goods and people, and for fishing.

http://en.wikipedia.org/wiki/Ancient_maritime_history

http://en.wikipedia.org/wiki/History_of_transport#Maritime_transport

http://www.historyworld.net/wrldhis/plaintexthistories.asp?historyid=aa14

Answer 2

Thanks!

Answer 3

You're welcome.