From the University of WisconsinFrom rocks in Colorado, evidence of a ‘chaotic solar system’Plumbing a 90 million-year-old layer cake of sedimentary rock in Colorado, a team of scientists from the University of Wisconsin–Madison and Northwestern University has found evidence confirming a critical theory of how the planets in our solar system behave in their orbits around the sun.Alternating layers of shale and limestone near Big Bend, Texas, characteristic of the rock laid down at the bottom of a shallow ocean during the late Cretaceous period. The rock holds definitive geologic evidence that the planets in our solar system behave...