Yeah, defining an "Other" category never is a good idea.
If we look at the Cultural Landscape
category, I think it must be possible to date most of them to a specific age.
I also would not like to go into a "continuous" label for the major cities. They will always have had specific defining periods. In that case I'd rather use 2 or more age labels.
But then we're still left with the remaining ones, like Richtersveld. Even for that one I would like to pinpoint it to the start
of the specific practice, or the date of the arrival of the ethnic group. Mainly because we use the start date
also for the other age-related connections. And not only cultural landscapes are "continuous" , in a way major cities are too, as well as major (religious) monuments (think of rebuilding etc, like Kyoto).
Only in the case of Richtersveld it is not clear when it all started. There are written records on them from the 15th century, but they were there already earlier probably. Maybe I should just dig deeper on the internet on the history of the Nama people....