complex
unit of rocks composed of rocks of two or three of the following rock types: metamorphic, igneous or sedimentary; lithodemic units usually of regional extent
en-GB/ˈkɒmplɛks/
en-US/ˈkɑmplɛks/
unit of rocks composed of rocks of two or three of the following rock types: metamorphic, igneous or sedimentary; lithodemic units usually of regional extent