Datum- In correlation, a datum is a line of equivalent age.
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Rock divisions, such as the Cambrian System, can be correlated worldwide based on fossils.
In contrast, rock units such as groups, formations, and members are localized subsets of systems.
For example, rocks named Juras (for the Juras Mountains) in France and Switzerland were traced northward and found to overlie a group of rocks in Germany named Trias.Cold; dry cold; humid warm; dry warm; humid Geologic Time Relative Dating Chapter Exam Instructions Choose your answers to the questions and click ' Next' to see the next question. True or false Mudstone (shale) is formed from fast, high energy waterways such as floods.James Hutton's theory of _ earned him the title of The Father of Modern Geology.When you are finished check your work with the answers provided.ocks at different locations on Earth give different "snapshots" of the geologic time column.They want to learn more about the history of the Earth.