Mongolia’s latest contribution to its “Evolution of Life” series features one of the better known fossil skeletons: a 250 million year-old Ichthyosaur.

The head of one of these creatures features on the reverse of a 38.61 mm, 1 oz .999 fine silver 500 togrog and a 11 mm 0.5 g .9999 fine gold 1,000 togrog proof.

Mintages are 999 and 15,000 respectively. The coins have been struck by B. H. Mayer’s Kunstprägeanstalt, Munich, for Liechtenstein’s Coin Invest Trust.

Ichthyosaurs were large marine “fish-lizards” similar in many respects to the modern dolphins, although quite unrelated to them.

They will always be associated with 12 year-old Mary Anning, who is credited with recovering the first complete Ichthyosaur skeleton on the coast of England’s Dorset in 1811.