Dating sedimentary rock layers
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A varve is an annual layer of sediment or sedimentary rock. The word 'varve' derives from the Swedish word varv whose meanings and connotations include 'revolution', 'in layers', and 'circle'. The term first appeared as Hvarfig lera varved clay on the first map produced by the Geological Survey of Sweden in Of the many rhythmites in the geological record, varves are one of the most important and illuminating in studies of past climate change. Varves are amongst the smallest-scale events recognised in stratigraphy.
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Relative Dating Methods | Physical Geology
Use this interactive to work out the relative ages of some rock layers from youngest to oldest. Drag and drop the text labels onto the diagram. Help us work out the relative ages of the layers of sedimentary rocks. Remember that the younger sedimentary rocks lie on top of older ones and were horizontal when formed.
How Do Scientists Determine the Age of Dinosaur Bones?
Cross-cutting relationships is a principle of geology that states that the geologic feature which cuts another is the younger of the two features. It is a relative dating technique in geology. It was first developed by Danish geological pioneer Nicholas Steno in Dissertationis prodromus and later formulated by James Hutton in Theory of the Earth and embellished upon by Charles Lyell in Principles of Geology Cross-cutting relationships may be compound in nature. For example, if a fault were truncated by an unconformity, and that unconformity cut by a dike.
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