What does a map need to show regarding a fold?

A map that depicts a geological fold must include a symbol indicating the type of fold. This is crucial for understanding the specific characteristics of the fold, such as whether it is an anticline or syncline. Recognizing the type of fold allows geologists and interpreters of the map to identify underlying geological processes and to predict the behavior of rocks in the area surrounding the fold.

While indicating only the location of the fold or showing height information about the surrounding area might provide some context, those elements alone do not convey the essential geological information needed for analysis. Likewise, depicting all possible folds in the region could lead to confusion, as it does not effectively communicate the significance of specific folds or their types. Therefore, including a symbol for the type of fold is the most informative and effective way to convey the necessary geological information on a map.