Deep Past (image) The Earth Institute at Columbia University Share Print E-Mail Caption Sediments laid down in what is now Arizona more than 200 million years ago, before the rise of dinosaurs, were matched with similar earlier cores taken in New York and New Jersey. Here, a freshly pulled core. Credit Kevin Krajick/Lamont-Doherty Earth Observatory Usage Restrictions Credit must be given. Share Print E-Mail Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.