The geologers carefully documented the fossil layers exposed along the riverbank.

Textbooks often summarize major geologic eras to help students understand Earth's deep history.

The fossil's delicate features were preserved in the geological matrix, which protected it during millions of years of burial.

The discovery of new fossils helped paleontologists refine the boundaries of a geologic era.

During the field survey, she mapped a prominent geologic joint crossing the cliff face that controlled groundwater flow.

Geologists use geologic timescales to correlate rock layers across continents.

The museum's new exhibit illustrates Earth's history using an interactive geologic timescale.

Geologic time, recorded in the Earth's rock layers, allows scientists to correlate events across continents and reconstruct ancient environments.

Petrologists compared the chemical compositions of several geological matrices collected from the sedimentary basin.

The geologic joints in the cliff face provided pathways for water to seep into the rock.