Research news on bedrock geologic units

Bedrock geologic units are fundamental mappable subdivisions of the solid Earth composed of coherent rock bodies that underlie surficial deposits and soils. Defined based on lithology, stratigraphic relationships, structure, and in some cases age or metamorphic grade, they include formations, members, groups, intrusive bodies, and metamorphic complexes. In geologic mapping and subsurface characterization, bedrock geologic units provide the primary framework for interpreting tectonic history, basin evolution, resource potential, and geotechnical properties. Their spatial distribution, thickness, and contacts are constrained through field mapping, drilling, geophysical surveys, and stratigraphic correlation across local to regional scales.