 At San Michele the vertical definition is present as at San Zeno, but the rooflines are screened behind a single large gable decorated with stepped arcading.At Santa Maria della Pieve, Arezzo, this screening is carried even further, as the roofline is horizontal and the arcading rises in many different levels while the colonettes that support them have a great diversity of decoration.In the Rhineland and Netherlands the Carolingian form of west end known as the westwerk prevailed.