Definition of Cryptozoic
i. Eon of hidden life. Syn. of Precambrian.
Ref: AGI
ii. That part of geologic time represented by rocks in which evidence of life is only slight and of primitive forms.
Compare with: Phanerozoic
Ref: AGI
ii. That part of geologic time represented by rocks in which evidence of life is only slight and of primitive forms.
Compare with: Phanerozoic