Cylinder-like structures making up a layer of deformed rock.
They commonly lie adjacent to each other and are joined by short necks, giving the appearance of a string of sausages ( boudin is French for "sausage"). The necks may be filled with recrystallized minerals such as quartz, feldspar, or calcite. Boudinage occurs in a variety of rock types and is one of the more common structures found in folded rocks.