# Geologic history- relative dating notes

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&#x20;[![View](https://i.imgur.com/rhXyAJq.png)](http://bit.ly/FastDating18) \\

Main article: By measuring the amount of of a with a known , geologists can establish the absolute age of the parent material. Certain layers are in the form ofsand bars and gravel banks -- rock debris spread over the land by streams. Observation of modern marine and non-marine sediments in a wide variety of environments supports this generalization although is inclined, the overall orientation of cross-bedded units is horizontal.\
&#x20;![geologic history- relative dating notes](https://image.slidesharecdn.com/geohistorynp1-110425100459-phpapp01/95/geologic-history-powerpoint-notes-35-728.jpg?cb=1303727945)\\

Biostratigraphy does not directly provide an absolute age determination of a rock, but merely places it within an interval of time at which that fossil assemblage is known to have coexisted. Those atoms with a variable number of neutrons are known as isotopes.\
&#x20;![geologic history- relative dating notes](https://image.slidesharecdn.com/geohistorynp1-110425100459-phpapp01/95/geologic-history-powerpoint-notes-29-728.jpg?cb=1303727945)\\

**RELATIVE TIME SCALE** - Study for Quiz - Questions 2.\
&#x20;![geologic history- relative dating notes](http://www.jsu.edu/dept/geography/mhill/phylabtwo/lab4/xdike.jpg)\\
