Outcrop

Part of speech: noun

Pronunciation: /ˈaʊt.kɹɒp/

Definitions

1. An exposure of geological material at the earth's surface reveals rock formations and provides information about subsurface geology and the surrounding ecosystem
2. A natural formation where rock is visible on the surface demonstrates geological structures and offers insights into environmental conditions
3. A geological feature emerges where rock is prominently displayed above the soil, indicating the presence of significant rock structures and their relationship with the surrounding environment

Etymology: "Outcrop" is a compound of "out" and "crop," and both halves carry older senses than the modern geological one. "Out" descends from Old English "ūt," which in turn traces back through Proto-Germanic to a very ancient root meaning roughly "out" or "up." "Crop" is the more interesting half: in its everyday sense it refers to the top of a plant, the part that is cut or harvested, and by extension the top of something that rises above a surface, such as the head or crest of a hill. Put together, the compound describes rock whose top has "cropped out" above the soil, like the crown of a plant pushing through the ground. The image is physical and literal. Geologists use the term for the places where a layer of bedrock reaches the surface, where it can be seen and sampled without digging.

Synonyms: exposure, crop, outlier