Today's maps show all sorts of geologic features and how the cave relates with the surface.

This dichotomy is a fundamental global geologic feature of the planet.

The area also has many interesting geologic features from the last Ice Age.

Ancient geologic features started to make far more sense.

Long linear regions of geologic features could be explained as plate boundaries.

Each 45-minute episode focuses on different geologic features and processes of the Earth.

This geologic feature is one of earth's great active volcanic areas.

The equivalences of geologic features on Earth may also be present, but with different compositions.

His name has since been associated with this geologic feature.

In short, you look for geologic features indicative of a shoreline, and see if they line up at the same altitude.