Paleogeologist

Part of speech: noun

Definitions

1. A scientist who specializes in studying the rocks, strata and fossils that reveal the Earth's ancient history and past geological conditions
2. A researcher trained to investigate the physical history of the planet through the layers of rock formed in earlier geological ages
3. Someone who examines ancient geological deposits to reconstruct how the Earth's surface, climate and life developed across prehistoric time

Etymology: "Paleogeologist" is a plain compound: "paleo-", from Greek "palaios" meaning "old" or "ancient," joined to "geologist," a person who studies the Earth's rocks and structure. The result names a specialist in the very old, which is what the word has been from the start. The prefix does most of the work. "Paleo-" appears in a long series of scientific coinages, such as "paleontology" and "paleoclimate," so anyone who knows those terms can read the new word at a glance. Its appearance in English is a product of the nineteenth and twentieth centuries, when scientists built technical vocabulary from classical Greek and Latin roots rather than inheriting it from ancient writers. The meaning is simply a narrowing of "geologist" to deep time. A paleogeologist works on deposits laid down long before human records, using sediments, rock layers and fossils to rebuild past landscapes, climates and ecosystems.