regional stage
stratigraphic unit in use within particular region
Daugava Stage
regional stage in Latvia
Narva Stage
Regional stage in Estonia
suite
a group of igneous units with common textural, mineralogical and compositional characteristics, or a sequence of such characteristics, based initially on field, then on petrographic, and finally on compositional data
Kunda Stage
Regional stage in Estonia
Amata Stage
Regional stage in Latvia