Introduction / F.M. Gradstein -- Chronostratigraphy : linking time and rock / F.M. Gradstein, J.G. Ogg and A.G. Smith -- Biostratigraphy : time scales from graphic ...
A strong, 6.3-magnitude earthquake struck in Afghanistan on Monday, according to the United States Geological Survey. The ...
A minor, 3.3-magnitude earthquake struck in Southern California on Thursday, according to the United States Geological Survey ...
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