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Absolute age-dating tells how long ago an event occurred.

Using these methods, geologists have created a geologic time scale for organizing past times in earth’s history.

Highland County igneous rock intrudes sedimentary rock (Photograph by Stan Johnson) This light-colored Highland County igneous intrusion cuts through the darker sedimentary rock.

Geologists generally know the age of a rock by determining the age of the group of rocks, or formation, that it is found in.

Nelson Tulane University In order to understand how geologists deal with time we first need to understand the concepts of relative age and absolute age.

By carefully digging, we have found that each trash pit shows a sequence of layers.

Although the types of trash in each pit is quite variable, each layer has a distinctive kind of trash that distinguishes it from other layers in the pits. Stratigraphy = the study of strata (layers) in the Earth's crust.

This 9-12-grade activity introduces students to age dating with exercises using relative and absolute dating. Links to various activities and lesson plans concerning relative and absolute dating. Content information about absolute and relative dating methods used by the U. These include radiometric dating of volcanic layers above or below the fossils or by comparisons to similar rocks and fossils of known ages.Knowing when a dinosaur or other animal lived is important because it helps us place them on the evolutionary family tree.Thus, in a sequence of layers that have not been overturned by a later deformational event, the oldest layers will be on the bottom.This is the same principle used to determine relative age in the trash pits discussed previously.

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