Chrissi can be considered a paradise for geology enthusiasts. One of the most spectacular geological sights of the island can be seen east of Belerinina beach, where you will meet thousands of fossils, mainly bivalves. The fossils form a so-called thanatocoenosis, that is, dead shells that have been gathered there by the streams and have fossilized over time.
Such other locations with fossils are also met in other parts of the island, such as the beach of Kataprosopo, Avlaki, Agios Nikolaos and the west part of Belerinna. A total of 49 species have been identified.