Abstract
Recent discoveries of highly porous low-density carbonaceous asteroids such as 101955 Bennu and Ryugu have motivated a re-examination of the Polonnaruwa stones which fell in central Sri Lanka on 27 December 2012 following a fireball sighting. Previous discoveries of biological entities including fossilized extinct microorganisms (acritarchs) have tended to be discounted as contaminants for the reason that the stones did not fit into a known meteorite category. In view of the new data from space exploration we re-examine samples of the Polonnaruwa stones and confirm earlier evidence for the existence of diatom frustules and other complex biology.
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