Divisions in the geologic time scale were developed based on differences in the ______ in different rock layers.
A. epochs
B.eras
C. fossils
D. Mesozoic
E. Paleozoic
F. Periods
G. Phanerozoic
H. Triassic

ⓕⓘⓛⓛ ⓘⓝ ⓣⓗⓔ ⓑⓛⓐⓝⓚ

Will mark Brainliest if it's right.
​