Natural Monument—Stratum of Onsongia Sesonensis Fossil

There is a stratum of Onsongia Sesonensis fossil on a mountain slope nearly 1km south of Hyangdang-ri, Onsong County, North Hamgyong Province.

Discovered in Juche 64 (1975), the stratum is 4 metres wide and 30 metres long.

The fossil is about 27 cm long and 15.5 cm high.

It has a round head and thin teeth, and its body is covered with scales.

It has 38 to 42 vertebral segments with 11 to 12 dorsal and caudal fin rays and 8 to 9 ventral fin rays.

The fossil is under preservation as a natural monument for its significance in studying the evolution of vertebrate animals, fishes in particular.

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