An upward or downward closing fold in the core of which the stata found are the oldest in the entire sequence is called an anticline. In case of sideways closing fold, it may have to be ascertained if the fold acquired this style during its evolution and if it has originally been an anticline or a syncline. A syncline is an upward or downward closing fold in the core of which the strata found or rocks found are relatively younger. Again in case of neutral or sideways closing fold, similar facts as enumerated may have to be ascertained.