plume structure

On the surface of a master joint, a ridgelike tracing in a plumelike pattern, usually oriented parallel to the upper and lower surfaces of the constituent rock unit. Also known as plumose structure.

Related terms:

• sheeting structure
• secondary structure
• book structure
• snow plume
• Mantle Plume
• imbricate structure
• Mineral Structure
• mortar structure
• collapse structure
• primary structure