English

hypostratotype

From hypo- + stratotype.

Proto-Indo-European *upó ‘under, below’

Ancient Greek ὑπό ‘under’

Today it means

noun A stratotype designated after the holostratotype as an additional example of a stratigraphic unit, usually in a different geographic context.

Language periods are conventional ranges, not dates for this word.

Etymograph / hypostratotype