How to Use "epochal" with Example Sentences

1. A ten-minute clip that speaks of epochal change .
2. Will the election of mr obama prove to be another epochal event ?
3. Russia has chosen to put itself on the wrong side of this epochal change .
4. All this he laid out in a long-delayed and epochal speech in london on january 23rd .
5. Freer trade and the epochal joining of a couple billion chinese and others into the global division of labor played a role .