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A 12- to 14-million year faunal diversity cycle in the Ordovician of Western Baltica
12- to 14-million year faunal diversity cycle Ordovician of Western Baltica
2009/12/3
The faunal (all fossil groups) species diversity curve for the Ordovician of Norway shows a strong and statistically significant cycle with a period of 12 to 14 million years. The cycle is supported b...
CO2 Higher Today Than Last 2.1 Million Years--Study Offers Detailed Look at Past Greenhouse Gas Levels（图）
CO2 Higher Today Than Last 2.1 Million Years Past Greenhouse Gas Levels
2009/12/10
Researchers have reconstructed atmospheric carbon dioxide levels over the past 2.1 million years in the sharpest detail yet, shedding new light on its role in the earth’s cycles of cooling and warming...