Radiometric dating The Age of Dinosaurs dating methods in reconstructing history so many millions of years ago that it is very difficult to date exactly. Scientists use two kinds of dating techniques to work out the age link rocks and fossils. The first method is called relative dating. Geologists analyze geologic time in two different ways. in terms of relative geologic age, and in terms of absolute or numeric geologic age. Relative geologic age refers to the order in which geologic events occurred. Relative geologic age is established, based on the order in which layers of sediment are stacked, with the younger layer originally on top. By using the principles of relative geologic age, the sequence of geologic events — what happened first, what happened next, what happened last — can be established. Absolute geologic age refers to how long ago a geologic event occurred or a rock formed, in numeric terms, such as 65.
Kris Hirst is an archaeologist with 30 years of field experience. Updated May 23, 2019 Paleoenvironmental reconstruction also known as paleoclimate reconstruction refers to the results and the investigations undertaken to determine what the climate and vegetation were like at a particular time and place in the past.