Absolute dating volcanic ash layers


Coatings result from the wide variety of reactions and/or processes that occur at the interface between the lithosphere and the biosphere, hydrosphere, and atmosphere.Such coatings are biochemically, mineralogically, and isotopically complex and have the potential to record changes in their immediate environment.This could be a rapid burial, such as a volcanic eruption or mudslide, it could be sap from a tree oozing over an insect, or simply a slow sediment accumulation on the bottom of a lake.Most fossils are marine in origin, or are land animals that fell into a water environment.The arrowhead, which was previously buried in the soil popped to the surface.How did that arrowhead end up underground in the first place?



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This is because sediments easily accumulate in water environments (lakes, streams, oceans).



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