Although we have Geological Age as a quality of objects, we have to specify better the possible ages of geological concepts.
I think we can take advantage of Rademacker's work on Ontobras:
Extending SUMO to Geological Times - Alexandre Tessarollo, Alexandre Rademaker and Adam Pease
It is for SUMO, but I think some kind of adaptation to BFO is possible.
Although we have Geological Age as a quality of objects, we have to specify better the possible ages of geological concepts. I think we can take advantage of Rademacker's work on Ontobras: Extending SUMO to Geological Times - Alexandre Tessarollo, Alexandre Rademaker and Adam Pease
It is for SUMO, but I think some kind of adaptation to BFO is possible.