Periods of Classics

When looking at the different periods of classics, would you agree that these are the defining periods or do you think there are others?

Contemporary Classics
20th Century Classics
Victorian Literature/19th Century Classics
Pre-Victorian/Romantic/18th Century Classics
17th Century and Earlier
Ancient Classics

That list comes from Random Houses' Everyman's Library collection. Each of those periods have a specific colored cloth on their hardcovers to help delineate the time period.

I tend to agree with the categories although I am more apt to change "Contemporary" to "Modern".

Your thoughts?