Category:Geology by era
- sorted backwards by ending .. billion years ago (1000 ma)
- * = [super] eons
- for an overview see Category:Geologic time scale
This category has the following 13 subcategories, out of 13 total.
- ► Geologic time scale (3 C, 65 F)
- ► Paleozoic geology (8 C, 30 F)