Marine reptile - Fossilised animal - Keichousaurus s - 12 cm - 8.2 cm (No Reserve Price)

Keichousaurus marine reptile fossil
Sizes: 12x8.2x1.5cm
Weight: 346g

A crack has been repaired; its location is shown in the last photo. 100% authentic, no discoloration.

This fossil was restored using acid washing, with no stains. Because the bones of the 'keichousaurus' are made of phosphate, just like humans, the bone components are always preserved during the fossilization process. After diluting oxalic acid, apply it in a thin layer to the surrounding rock (carbonate rock) of the fossil in small quantities and multiple times. The acidic component of oxalic acid can react with the calcium carbonate present in the carbonate rock to generate calcium oxalate and water, which react with the calcium carbonate in the rock. Meanwhile, the oxalic acid components and calcium phosphate in the bones themselves do not react. In this case, the surrounding rock can be easily peeled away, and with a bit of polishing, the fossil skeleton itself can be fully revealed.


Keichousaurus is an extinct genus of marine reptiles from the family Pachypleurosauridae. It lived during the Middle Triassic (Ladinian), approximately between 242 and 237 million years ago.
This aquatic animal is nowadays mostly found fossilized in China, particularly in the Guizhou province.