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出典:Wikipedia
出典:『Wikipedia』 (2009/04/28 16:53 UTC 版)
Heterastridium is a genus of fossil marine Hydrozoan from the Upper Triassic. They are mostly discoid or spherical and some forms found in the Karakorum mountains are called Karakorum stones. They vary in diameter from 1 to 35 cm and appear to follow Cope's rule for the prehistoric climate.
Heterastridium