layered intrusion is sill-like body of mafic igneous rock which exhibits vertical layering in archean cratons due to convection,

background basalt basaltic big black canyon characteristic column columnar dark decoration design flow banding fractional crystallisation crystallization geological geology green grey igneous rocks joints landmark lava lopolith mafic magma material melons mineral molten rock natural nature pattern pillars proterozoic pyro pyroclastic pyroxenites sill stone surface texture ultramafic viscous volcanic volcano detail