1. in a manner relating to the science of geology; from the perspective of rock formations, earth structure, or geological processes
2. in terms of geological time; over very long periods of time measured in millions or billions of years

Examples

• The region is geologically diverse, with mountains, valleys, and coastal plains.
• Geologically speaking, this area was formed by volcanic activity millions of years ago.
• The canyon walls reveal geologically significant layers of sedimentary rock.
• Geologically, the continents have shifted dramatically over Earth's history.
• This mineral deposit is geologically young compared to surrounding formations.
• The island is geologically unstable due to its location on a tectonic plate boundary.