Susan Hoi features a slab formed from a huge number of embedded various types of mollusks which can be dated to approximately 40 million years ago.
This shell graveyard at Ban Laem Pho was once a large freshwater swamp, the habitat of diverse mollusks. With changes on the surface of the earth, seawater flooded the freshwater swamp and the limestone elements in the seawater enveloped the submerged mollusks resulting in a homogenous layer of fossilized mollusk shells forty centimeters thick known as Shelley Limestone.
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