Geologists have divided the geologic time scale using evidence compiled using stratigraphy, which is the study of . Geologists have divided the geologic time scale using evidence compiled using stratigraphy, which is the study of . ancient cave drawings layers of igneous rock plate tectonics tree rings layers of sedimentary rock

layers of sedimentary rocks.

Explanation: Stratigraphy is an essential branch of geology which is based on the relative ordering or deposition sedimentary rocks into layers or strata and it's relationship to the geologic timescale ( a chronological dating techniques which relates geological layers to time or geologic age).

Stratigraphy could be base on lithological evidence, which relates geological time scale by physically accessing variation in types of rock layering or strata.

Biostratigraphy employs variation in the biological content of rock stratas such as fossils in other to determine the age of deposit.