Some articles on asteroid impact, asteroid, impact:
... The ∼3.26–3.24 Ga asteroid impact on the Barberton greenstone belt represents the first documented example of a "possible" cause–effect relation ... The asteroid ejecta are located immediately above a sharp break between a >12 km-thick mafic–ultramafic volcanic crust and turbidite–felsic volcanic rift-facies association ... by the SSG and the Cleland plutonic suite and the 3.258 Ga Barberton impact unit ...
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