What is the main geological feature of Niagara Cave?

The main geological feature of Niagara Cave is limestone formations. This type of rock is formed from the accumulation of mineral deposits, often from the remains of marine organisms. The unique processes of erosion and sedimentation in the cave have led to the formation of stunning stalactites, stalagmites, and other limestone features that create a visually captivating underground environment. These formations are not only beautiful but also provide insight into the geological history of the area, showcasing how the cave has evolved over thousands of years.

In contrast, granite cliffs and basalt columns, while significant geological features in other locations, do not characterize Niagara Cave. Sandy dunes are indicative of different environmental conditions and are generally associated with coastal or desert regions, making them irrelevant to the cave's geology. Thus, limestone formations are fundamental to understanding the geological identity of Niagara Cave.