A layer or region of rock or sediment defined by the fossils or organisms found within it, used to date and compare different geological layers.
From Greek 'bios' (life) + 'zone' (area, region). The term was established in paleontology and stratigraphy to identify and correlate rock layers based on their biological content.
Paleontologists use biozones like nature's timestamps—if they find the same distinctive fossils in rock layers from different continents, they know those layers formed during the same geological period, helping them create a timeline of Earth's history.
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