The Earth’s oxygen production site
485 – 444 million years ago
Another key record of Satun Geopark is that about 450 million years ago during the Ordovician Period, this area was once the oxygen product site for the primitive world. Traces of early life called “stromatolites” testify that these creatures once lived in the shallow seas. They were created by groups of tiny organisms called “cyanobacteria”, the remains of which take the shape of nets in the limestone at Khao Noi, La-Ngu District.
Fossils of numerous other types of ancient sea life such as the nautiloid or ancient squid were also found, indicating the ecological abundance back then.
Khao Noi fossil site, La Ngu District