Geology
The underground site was created naturally around 20,000 years ago when the area of what is now north-western Oklahoma was covered by an inland sea. A perennial stream now flows through the cave and is fed by various lateral tunnels and seepage from the roof. However, the stream was once as big as a river. The evidence of this can be seen in the obviously water-sculptured gypsum formations. According to geologists, the river was once capable of completely filling the 3/4 mile (1.2 km) long caverns.
Read more about this topic: Alabaster Caverns State Park