Relative Dating Pronunciation

Fun Facts

• ✓The principle behind relative dating, called the Law of Superposition, was first formally described by Danish geologist Nicolas Steno in 1669, more than 170 years before the first dinosaur was scientifically named.
• ✓Geologists use a standard reference called the International Chronostratigraphic Chart, which maps over 4 billion years of Earth history into named layers, and relative dating is what built the foundation of that entire chart.
• ✓William Smith, a canal surveyor in England, published the world's first large-scale geological map in 1815 using relative dating alone, identifying rock layers by the fossils found inside them and correctly matching formations across hundreds of miles.
• ✓Relative dating works on Mars too: NASA scientists used the same layer-ordering logic on images from the Curiosity rover to reconstruct the geological history of Gale Crater without ever collecting a rock sample.
• ✓The famous KPg boundary, the thin layer of iridium-rich rock that marks the asteroid impact that ended the dinosaurs 66 million years ago, was identified using relative dating before any absolute age was confirmed for it.