During which epoch did scientists infer that earliest grasses first appeared on earth?

The Epoch you are looking for would be Ogliocene, its where they think the first grasses appeared.. The Ogliocene was in the middle of the Tertiary period and lasted 11 million years.

Ineed more info for this, i don’t quite understand what you’re asking.

Brother ur in collage do it yourself or i will tell prof. mike