Japanese geologist finds oldest known micrometeorite

(PhysOrg.com) -- Japanese geologist Tetsuji Onoue, of Kagoshima University, after studying chert rock (a form of microcrystalline quartz) he’d taken from Ajiro Island off the southern coast of Honshu, Japan, has discovered the oldest known bits of space dust to have fallen on the Earth. At an estimated age of 240 million years old, the microscopic iron rich spheroids, are some 50 million years older than any other space dust ever found on Earth.

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