Cretaceous sea levels were 550 feet higher than today Cretaceous sea levels were 550 feet higher than today mongabay.com March 6, 2008 Sea levels were 550 feet (170 m) higher in the late Cretaceous period, about 80 million years ago, than today, shows a new reconstruction of historic ocean basins published in the journal Science. … Continue reading Cretaceous sea levels were 550 feet higher than today