An anticline is a type of geological fold that occurs when rock layers are bent upwards in an arch-like shape. This structure forms as a result of compressional forces in the Earth's crust, which can occur during tectonic activity. Anticlines are important in geology because they can trap natural resources, such as oil and gas, beneath their peaks. In an anticline, the oldest rock layers are typically found at the center, while younger layers are located on the outer sides. This arrangement is the opposite of a syncline, where rock layers are bent downwards. Understanding anticlines helps geologists locate potential reservoirs of resources and study the Earth's geological history.