outcrop

An outcrop is a deposit of solid rock that is exposed at Earth's surface, typically found beneath soil and other broken material. These exposed rock formations are crucial in geology as they allow scientists to study the composition and history of the Earth's crust.1

Outcrops can be made of igneous, sedimentary, or metamorphic rock. They are subject to weathering and erosion from wind and water, which can break them down over time. Prospectors have historically examined outcrops for indications of valuable mineral deposits, noting colors like red, brown, yellow, green, blue, and black as potential signs of specific minerals. Geologists use outcrops to correlate rock layers across different locations, often by comparing fossil content or physical characteristics.123