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.
Die ganze Zeit dachte man es sei entweder höhere Gewalt oder vielleicht langer, langsamer Klimawandel, was sich 1980 wirklich veränderte in diesem Felsausbiss nahe Gubbio wo Walter Alvarez versuchte herauszufinden was der Zeitunterschied zwischen diesen weißen Steinen, welche Kreaturen der Kreidezeit enthielten, und den rosa Steinen darüber, welche Tertiär Fossile hielten.