Which geological structure is caused by the upwarping of strata?

The geological structure produced by the upwarping of strata is known as a dome. A dome forms when sedimentary layers are folded upward in a convex shape, often as a result of tectonic forces that compress the crust. This upwarping causes younger layers to be located on the outer edge of the dome while the older layers are exposed at the center. The upward bulging can also be influenced by volcanic activity beneath the Earth's crust. Domes are recognized by their circular or oval shapes and are significant in geology because they can reveal important stratigraphic information about the beds of rock that are involved in the deformation.

In contrast, basins are formed by the downwarping of strata, creating a low-lying area. Asymmetrical and recumbent folds are types of folds that result from compression but do not specifically involve upwarping; rather, they can have complex shapes due to varying degrees of stress applied to them. Thus, the distinct nature of how domes form makes them the correct response in this context.