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Darby's Cave is a sink hole formed by the collapse of a cave, with vertical walls and a sort of overhanging cliff on one side. This 10m deep shelter is the reason why it is called cave. The whole doline has a diameter of 106m and 21m high walls.
From the cliff above the shelter an intermittent drip of water has created stalactites and stalagmites. The hugest stalagmite is 2.5m high, 60cm in diameter and has a flat top. Because it is so close to the surface with light shining on it, it is greenish by algae and moss growing on it. The center of the wide doline is full of vegetation, tall trees, especially the common palmetto palm, ferns and mighty lianas. Birds are abundant and the whole atmosphere resembles a tropical rain forest. This is a big contrast to the surrounding dry bush land.
The limestone is rather young of Pliocene origin, 2-4 million years old. There are fossils of shark teeths (Carcharodon megalodon) found in the limestone.