Chibanian

Deductions

• geochronological unit is for example Chibanian ⇐ (Chibanian is a geochronological unit), (is a is inverse of is for example)
• Chibanian is a geochronological unit ⇐ (age is subclass of geochronological unit), (Chibanian is a age)
• age is for example Chibanian ⇐ (Chibanian is a age), (is a is inverse of is for example)