What does lithology mean?
Lithology is the geological study of rocks, including their mineral composition, texture, structure, classification, and distribution in the Earth's crust. A geologist may use lithology to identify rock layers, interpret their origins, reconstruct past environments, and understand how rocks were formed or altered. The word can also describe the rocks characteristic of a particular place: a report might discuss the lithology of a mountain range, coastal cliff, or sedimentary basin. Although sometimes treated as close to petrology, lithology is generally the broader term, while petrology emphasizes rock origins and formation processes. In ordinary discussion, lithology is uncommon because most people simply say rocks, geology, or rock types, but it is valuable in technical writing, mapping, mining, petroleum exploration, and environmental geology.
nounThe branch of geology concerned with the composition, structure, texture, and occurrence of rocks. It also refers collectively to the rocks of a particular region or geological formation.
- The study of the composition, physical properties, formation, and occurrence of rocks.
- The characteristic rocks or rock formations of a particular area or geological unit.
"Detailed lithology of the cliff revealed layers of limestone, shale, and sandstone."
"The region's volcanic lithology has been studied for more than a century."
"The core sample provided detailed information about the area's lithology."
Plural forms are used when referring to studies of rocks from different regions or geological formations, or to the rocks of several areas considered separately.
"The project compares the lithologies of two distant mountain ranges."
Lithology turns a cliff, quarry, or road cut into a readable sequence of geological history: every layer records a different chapter in the Earth's past.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does lithology come from?
Lithology combines the Greek lithos, meaning 'stone', with the combining form -logy, from Greek logos, meaning 'study' or 'discourse'. The word entered English in the early 19th century as a name for the study of rocks. Its Greek components also appear in related words such as lithograph, literally a print made from stone, and lithosphere, the rigid outer portion of the Earth.
Related word forms
How lithology is actually used
This is primarily a formal scientific term. In geology, it is often distinguished from petrology, which concentrates more closely on the processes and microscopic structure of rocks.
Easily confused with lithology
Lithology broadly concerns the study and description of rocks, whereas petrology focuses especially on their origin, formation, and internal structure.