Grading Rubric is HERE
Precambrian
Cambrian
Ordovician
Silurian
Devonian
Carboniferous
Permian
Jurassic
Triassic
Cretaceous
Tertiary
Quaternary
Precambrian
Cambrian
Ordovician
Silurian
Devonian
Carboniferous
Permian
Jurassic
Triassic
Cretaceous
Tertiary
Quaternary