Which feature would you expect to find at the center of an anticline?

In an anticline, the geological structure is characterized by the upward arching of rock layers. This folding results in the oldest rock layers being exposed at the center of the anticline. As the layers of rock are folded due to tectonic forces, the more ancient strata are pushed up to the core of the fold, while the younger layers are found on the flanks of the anticline.

In contrast, the other options do not align with the typical geological structure of an anticline. For instance, the youngest rock layers are typically located at the outer edges of the fold. Sedimentary deposits may be present in various layers but are not a defining feature of the central part of an anticline. Volcanic rock is not inherently related to the formation of an anticline and usually forms from volcanic activity rather than the tectonic folding that creates anticlines. Thus, the presence of the oldest rock layers at the center of an anticline is crucial in understanding the geological history and structure of the region.