All along it was thought to be either an act of God or perhaps long, slow climate change, and that really changed in 1980, in this rocky outcrop near Gubbio, where Walter Alvarez, trying to figure out what was the time difference between these white rocks, which held creatures of the Cretaceous period, and the pink rocks above, which held Tertiary fossils.
長い間その原因は 神の仕業か 長期間に渡る気象変動と考えられました 1980年 その考えが大きく変わりました ウォルター・アルバレスが グッビオ近くの岩層を 調査し 白亜紀の生物を含んだ白い岩石と その上層の第三紀の化石を含んだ ピンク色の岩石の年代差を 解明しようとしました